CBSE Class 10 Science HOTs Metals and Non Metals

Please refer to CBSE Class 10 Science HOTs Metals and Non Metals. Download HOTS questions and answers for Class 10 Science. Read CBSE Class 10 Science HOTs for Chapter 3 Metals and Non-Metals below and download in pdf. High Order Thinking Skills questions come in exams for Science in Class 10 and if prepared properly can help you to score more marks. You can refer to more chapter wise Class 10 Science HOTS Questions with solutions and also get latest topic wise important study material as per NCERT book for Class 10 Science and all other subjects for free on Studiestoday designed as per latest CBSE, NCERT and KVS syllabus and pattern for Class 10

Chapter 3 Metals and Non-Metals Class 10 Science HOTS

Class 10 Science students should refer to the following high order thinking skills questions with answers for Chapter 3 Metals and Non-Metals in Class 10. These HOTS questions with answers for Class 10 Science will come in exams and help you to score good marks

HOTS Questions Chapter 3 Metals and Non-Metals Class 10 Science with Answers

METALS & NON-METALS

Question : The metallic lustre exhibited by sodium is explained by :
(B) oscillation of mobile
(A) diffusion of sodium ions valence electrons
(C) existence of free protons
(D) existence of body centered cubic lattice
Answer : B

Question : Which of the following will appears silvery white ?
(A) Li
(B) K
(C) Na
(D) All
Answer : D

Question : Which of the following s-block metal does not react with water ?
(A) K
(B) Na
(C) Ca
(D) Be
Answer : D

Question : Which of the following option is correct for given reaction ?
M + H2SO4
(A) It reacts vigrously with acid if M is alkali metal.
(B) It reacts readily with acid if M is alkaline earth metal.
(C) metal sulphate and hydrogen gas will form after reaction.
(D) All are correct.
Answer : D

Question : Be reacts with excess of caustic soda to form :
(A) Be(OH)2
(B) BeO
(C) Na2[Be(OH)4]
(D) Be(OH)2.BeCO3
Answer : C

Question. Which of the following can undergo a chemical reaction?
(a) MgSO4 +Fe
(b) ZnSO4 + Fe
(c) MgSO4 + Pb
(d) CuSO4 + Fe
Answer : D

Question. Which one of the following metals do not react with cold as well as hot water?
(a) Na
(b) Ca
(c) Mg
(d) Fe
Answer : D

Question. Which of the following is the correct arrangement of the given metals in ascending order of their reactivity? 
Zinc, Iron, Magnesium, Sodium
(a) Zinc > Iron > Magnesium > Sodium
(b) Sodium > Magnesium > Iron > Zinc
(c) Sodium > Zinc > Magnesium > Iron
(d) Sodium > Magnesium > Zinc > Iron
Answer : D

Question. What happens when calcium is treated with water?
(a) It does not react with water
(b) It reacts violently with water
(c) It reacts less violently with water
(d) Bubbles of hydrogen gas formed stick to the surface of calcium
(a) (a) & (d)
(b) (b) & (c)
(c) (a) & (b)
(d) (c) & (d)
Answer : D

Question. The chemical reaction between a piece of copper and nitric acid is given by the chemical equations,
Cu + HNO3 → Cu(NO3)2 + H2
H2 + HNO3 → H2O + NO2
What can be inferred from the chemical equation?
(a) Copper causes the oxidation of HNO3 to form NO2.
(b) Hydrogen gas gets oxidized by HNO3 to form water.
(c) gas reacts with oxygen in the air to form water.
(d) Nitrate reacts with hydrogen to form NO2 and H2O.
Answer : B

Question. Which of the given non-metal is a liquid?
(a) Hydrogen
(b) Bromine
(c) Chlorine
(d) Mercury
Answer : B

Question. An element reacts with oxygen to form an oxide which dissolves in dilute hydrochloric aci(d) The oxide formed also turns a solution of red litmus blue. The element will be ……
(a) metal
(b) nonmetal
(c) both a and b
(d) none of these.
Answer : A

Question. Paheli took some crystals of copper sulphate and heated it. After some time, she added water to the content of test tube.
The two visible changes observed here are
(a) blue crystals changes to white powder, on adding water it regains its blue colour.
(b) blue crystals changes to pale green, on adding water it regains its blue colour.
(c) No change
(d) blue crystals changes to white crystals and become colourless
Answer : A

Question. A student makes an electric circuit using an LED, a battery and connecting wires to test the conductivity of distilled water. The student notices that the LED does not glow.
He replaces the distilled water with a salt solution and observes that the LED glows. How does the salt solution help the LED to glow?
(a) Salt solution is covalent in nature and conducts electricity.
(b) Salt solution has a low melting point which allows the current to flow through it.
(c) Salt solution has a high boiling point which allows the flow of current in the circuit without getting hot.
(d) Salt solution contain ions which makes it conductive and allows the electricity to flow through it.
Answer : D

Question. Which acid is formed when sulphur dioxide dissolves in water?
(a) Sulphuric acid
(b) Sulphurous acid
(c) Sulphate acid
(d) Sulphonic acid
Answer : B

Question : What is [X] in the following reaction ?
MgCl2.6H2O →Δ  [X] + HCl + H2O
(A) MgO
(B) Mg
(C) Mg(OH)2
(D) Mg(OH)Cl.
Answer : A

Question : When magnesium burns in air, compounds of magnesium formed are magnesium oxide and :
(A) Mg3N2
(B) MgCO3
(C) Mg(NO3)2
(D) Mg(NO2)2
Answer : A

Question : Products of following reaction :
NaOH + ZnO →
(A) Na2O, Zn(OH)2
(B) Na2ZnO2, H2O
(C) Na2O2 , Zn(OH)2
(D) None of these
Answer : B

Question : Products of the following reaction are : NaOH + S →
(A) Na2S, Na2S2O3 , H2O
(B) Na2SO4, H2O
(C) Na2O2, Na2SO4
(D) H2S , Na2SO4
Answer : A

Question : Which of the following can not decompose on heating to give CO2 in a dry test tube ?
(A) Li2CO3
(B) Na2CO3
(C) KHCO3
(D) BeCO3
Answer : B

Question : On addition of which metal, copper sulphate solution (blue colour) will be changed to colourless solution ?
(A) Fe
(B) Ag
(C) Zn
(D) Hg
Answer : C

Question : Which of the following will give displacement reaction ?
(A) NaCl solution and copper metal
(B) MgCl2 solution and silver metal
(C) FeSO4 solution and silver metal
(D) AgNO3 solution and copper metal
Answer : D

Question : Which of the following is a volatile liquid ?
(A) Chlorine
(B) Fluorine
(C) Bromine
(D) Iodine
Answer : C

Question : Which one of the following statements pertaining to the general properties of metals is WRONG ?
(A) Most of the metals form basic oxides.
(B) All metals displace hydrogen from acids.
(C) The hydroxides of heavy metals are converted to their oxides upon ignition.
(D) Metals form alloys with other metals.
Answer : D

Question : _______ is/are added in alumina at the time of electrolysis.
(A) Na3AlF6
(B) CaF2
(C) C
(D) (A) & (B) both
Answer : D

Question : The froth floatation process is based upon -
(A) The differences in the specific gravity of ore and gangue particles
(B) The magnetic properties of gangue and ore
(C) Preferential wetting of gangue particles by oil
(D) Preferential wetting of ore particles by oil
Answer : D

Question : In the metallurgy of copper , the impure metal got after Bessemerization is called :
(A) blister copper
(B) wrought copper
(C) brass copper
(D) pig copper
Answer : A

Question : Which oil is used as frother in froth floatation process ?
(A) Mustard oil
(B) Coconut oil
(C) Olive oil
(D) Pine oil
Answer : D

Question : Chemical method used in concentration of ore is also known as -
(A) bleaching
(B) leaching
(C) roasting
(D) calcination
Answer : B

Question : The smelting of iron in a blast furnace involves all the following processes except -
(A) combustion
(B) reduction
(C) slag formation
(D) sublimation
Answer : B

Question : Which of the following is purest form of iron ?
(A) Wrought iron
(B) Pig iron
(C) Steel
(D None of these
Answer : A

Question : Aluminium is not present in which of the following mineral .
(A) Cryolite
(B) Felspar
(C) Fluorspar
(D) Mica
Answer : C

Question : Match column A with column B and select the correct option -
Column A                      Column B
(Ore)                           (Nature of ore)
(a) Copper glance        (i) Sulphate ore
(b) Calamine               (ii) Halide ore
(c) Rock salt                (iii) Sulphide ore
(d) Epsom salt              (iv) Carbonate ore
(A) a(i), b(ii), c(iii), d(iv)
(C) a(iii), b(iv), c(ii), d(i)
(B) a(iv), b(ii), c(iii), d(i)
(D) a(iv), b(i), c(ii), d(iii)
Answer : C

Question : In the alumino-thermic process, aluminium acts as:
(A) An oxidizing agent
(B) A flux
(C) A reducing agent
(D) A solder
Answer : C

Question : Which of the following metal is found in native state ?
(A) Sodium
(B) Zinc
(C) Gold
(D) Iron
Answer : C

Question : Ore dressing for iron is done by -
(A) froth floatation process
(B) magnetic separation
(C) hand picking
(D) all of the above
Answer : B

Question : Copper is extracted from the ore copper pyrite by smelting in a blast furnace. The flux used and the slag formed are as given below :
(A) Flux CaO, Slag CaSiO3
(B) Flux SiO2, Slag CaSiO3
(C) Flux FeO, Slag FeSiO3
(D) Flux SiO2, Slag FeSiO3
Answer : D

Question : _______ is not present in gun metal .
(A) Cu
(B) Sn
(C) Zn
(D) Fe
Answer : D

Question : Baking soda is :
(A) Na2CO3
(B) Ca (OH)2
(C) NaHCO3
(D) NaCl
Answer : C

Question : Cl2 acts as bleaching agent because in presence of moisture it produces :
(A) O2
(B) Cl
(C) O
(D) HCl
Answer : B

Question : Molten sodium chloride conducts electricity due to the presence of
(A) free electrons
(B) free molecules
(C) atoms
(D) free ions
Answer : D

Question : The alloy used for the construction of bells is -
(A) tungsten steel
(B) nickel steel
(C) bell metal
(D) duralumin
Answer : C

Question : Sodium chloride is known as -
(A) Rock salt
(B) Common salt
(C) Table salt
(D) All
Answer : D

 

Assertion/Reason Type Question

Following Questions consist of two statements – Assertion (A) and Reason (R).
Answer these questions selecting the appropriate option given below:
A. Both A and R are true, and R is the correct explanation of A
B. Both A and R are true, and R is not the correct explanation of A
C. A is true, but R is false
D. A is False, but R is true

Question. Assertion (A) : Rusting of iron is a slow combustion
Reason (R) : Iron slowly reacts with oxygen and form iron oxide.
Answer : A

Question. Assertion (A) : MgCl2, is a covalent compound
Reason (R) :MgCl2, is a good conductor of electricity in molten state.
Answer : D

Question. Assertion (A) : Aluminium is more reactive than iron. Its corrosion is less than that of iron.
Reason (R) : Aluminium is covered with a strong protective layer of oxide which protects the metal from further corrosion.
Answer : A

Question. Assertion (A) : The oxides of sulphur and phosphorus are acidic in nature.
Reason (R) : Metal oxides are basic in nature
Answer : B

Question. Assertion (A) : Gold occurs in native state.
Reason (R) : Gold is a reactive metal.
Answer : C

 

Case Study Based Questions

1. When a silvery grey powder of a solid (A) is mixed with a powder solid (B) no reaction occurs. But if the mixture is ignited and lighted using magnesium ribbon a reaction occurs with evolution of large amount of heat forming product (C) which settles down as liquid metal and the solid product(D) formed floats on the liquid (C) . (C) in solid form reacts with moisture to form rust. The amount of heat generated during the reaction is so high that the reaction is used in welding of electric conductors, joints in railway tracks. Based on this information, answer the following questions.

i. Identify A and C?
(a) A- Al and C- Fe
(b) A-Fe and C—Al
(c) A-Mg and C -Al
(d) A-Al and C -Cu
Answer : A

ii. Identify B and D which are oxides of
(a) B- Fe , D- Al
(b) B- Mg, D-Al
(c) B- Al , D- Cu
(d) B-Al , D –Fe
Answer : A

iii . Amphoteric oxides are
(a) metal oxides which do not react with acids but react with bases
(b) metal oxides which reacts with both acids as well as bases
(c) metal oxides which reacts with acids but do not react with bases
D metal oxides which shows no reaction with either acids or bases
Answer : B

iv. Which of the following is amphoteric in nature?
(a) both aluminium oxide and zinc oxide
(b) Only Zinc oxide
(c) Only Aluminium oxide
(d) Neither of them
Answer : A

 

Questions with Answers:

Question: Carbon can reduce copper oxide to copper but not calcium oxide to calcium. Why?
Answer Carbon is a strong reducing agent so it can reduce copper oxide but calcium is much more reactive than copper and has greater affinity for oxygen than carbon has. So it cannot reduce calcium oxide to calcium. 

Question. A yellow coloured powder `X` is soluble in carbon disulfide. It burns with a blue flame forming suffocating smelling gas which turns moist blue litmus red. Identify `X` and gives chemical reaction. Identify it is metal or nonmetal. 
Answer :X` is sulphur S + O2 -> SO2 It is non metal. 

Question. Nikita took Zn, Al, Cu, Fe, Mg, Na metals & put each metal in cold water and then hot water. She reacted the metal with steam
(i) Name the metal which reacts with cold water.
(ii) Which of the above metals react with steam?
(iii) Name the metal which reacts with hot water.
(iv) Arrange these metals in order of increasing reactivity.
Answer : 
(i) Na
(ii) Al, Zn, Fe
(iii) Mg
(iv) Na>Mg> Al > Zn > Fe > Cu
 

Question. A student was given Mg, Zn, Fe, and Cu metals. He put each of them in dil HCl contained in different test tubes. Identify which of  hem
(i) will not displace H2 from dil HCl
(ii) forms a pale green substance
(iii) will give H2 with 5% HNO3
(iv) will be displaced from its salt solution by all other metals.
Answer : 
(i) Cu (ii) Fe (iii) Cu (iv) Cu 

Question. A metal `X` is found in the form of filings which burns vigorously when sprinkle on flame. When these filings are treated with sulphur a black colured compound `Y` is formed which is not attracted by magnet. `X` reacts with dil HCl to liberate hydrogen gas. Identify `X`, `Y``. Write the reaction involved.
Answer :  
Fe + S -> Fe S
`X` is Iron `Y` is Ferrous sulphide
Fe + HCl -> FeCl2 +H2
 
Question. A, B and C are 3 elements which undergo chemical reactions according to following equations:
a) A2O3 + 2B -> B2O3 + 2A
b) 3CSO4 + 2B -> B2 (SO4)3 + 3C
c) 3CO + 2A -> A2SO3 + 3C Answer of the following:
i) Which element is most reactive?
ii) Which element is least reactive?
Answer :  
i) Most reactive element is B as it has replaced both A and C from their compounds 
ii) Element C is least reactive as it has been replaced both by A and B. 
 
Question : Give reasons
i) Sodium, Potassium and Lithium are stored under oil.
ii) Addition of some silver to pure gold for making ornaments.
iii) Metals are good conductors of heat.
Answer : 
i) These metals are very reactive so they can combine with moist air and oxygen vigorously with liberation of large amount of heat that is why they are kept in oil. 
ii) Pure gold is very soft it is therefore not suitable for making jewelry . It is alloyed with either silver or copper to make it hard. 
iii) When a metal is heated, its atom gain energy and vibrate more vigorously. This energy is transferred to the electrons, which can move through the metal. They transfer their energy to other electrons and atoms. In this way they conduct heat and are good conductors. 
 
Question : Why does aluminum not react with water under ordinary condition? 
Answer :   Aluminum forms a thin tough layer of oxide on its surface. this oxide layer forms a protective coating on the metal and prevents it from further attack of water. 
 
Question. Metal sulphides occur mainly in rocks and the metal halides occur mostly in seas and lakes. What could be the reason for this? 
Answer :  Most of the metal sulphides are insoluble in water where as metal halides are generally soluble. the metal halides( NaCl , MgCl2 etc) are washed away with rain or river water in dissolved state and so the halide ores occur in lakes and seas. 
 
Question. Give the reason why copper is used to make hot water tanks but steel is not?  
Answer :   this is because iron present in steel reacts with steam to form ferrosoferric oxide whereas copper has no action with water . as a result of it , the body of steel tank becomes weaker and weaker in case of iron and not in case of copper.
3Fe + 4H2O --> Fe3O4 + 4H2 

Question. A metal acts as a good reducing agent. It reduces Fe2O3, and MnO2. The reaction with Fe2O3 is used for welding broken railway tracks. Identify the metal and write all the chemical reactions.

Answer :  Aluminium
3Mno2(s) + 4 Al(s)    3 Mn(l) + 2 Al2O3(s) +Heat
Fe2O3(s) + 2 Al (s)  →  2Fe(l) +Al2O3(s)  + Heat

Question. A yellow coloured powder `X` is soluble in carbon disulfide. It burns with a blue flame forming suffocating smelling gas which turns moist blue litmus red. Identify `X` and gives chemical reaction. Identify it is metal or nonmetal.

Answer : 
`X` is sulphur
S + O2  →  SOIt is non metal.

Question. An element reacts with oxygen to form an oxide which dissolves in dilutehydrochloric acid. The oxide formed also turns a solution of red litmus blue. Is the element a metal or non-metal? Explain with the help of a suitable example.
Answer : 
It is metal
4Na(s) + O2  →  2Na 2O (s)
Na 2O (s) + H2O(l) → 2naOH(aq)
Na 2O (s) + 2HCl (dil)  →  2NaCl (aq) +H2O (l)

Question.

Class 10 Hots Question Metals And Non Metals

Answer : 
(i) Yes the bulb glows, this indicates that metal is a good conductor of electricity
(iii) Rubber like substance is a bad conductor of electricity

Question. Royal water is prepared by mixing two acids `A` and `B`. It can dissolve gold and platinium. It is highly corrosive and fuming liquid. Identify `A` and `B`. What is the ratio in which `A` and `B` are mixed.
Answer : 
3HCl + HNO3

Question.. Four metals A, B, C and D are, in turn, added to the following solutions one by one. The observations made are tabulatd below: Answer the following questions based on above information.

CBSE_Class_10_Science_Metal_And_NonMetal_1

(i) Which is the most active metal and why?
(ii) What would be observed if B is added to a solution of copper (II) sulphate and Why?
(iii) Arrange the metals A, B, C and D in order of increasing reactivity.
(iv) Container of which metal can be used to store both zinc sulphate solution and silver nitrate solution.
(v) Which of the above solutions can be easily stored in a container made up of any of these metals?
Answer : 
(i) B
(ii) Displacement reaction. Because B is more reactive than Cu.
(iii) B.>A.>C.>D
(iv) D 
(v) ZnSO4

Question. Nikita took Zn, Al, Cu, Fe, Mg, Na metals & put each metal in cold water and then hot water. She reacted the metal with steam.
(i) Name the metal which reacts with cold water.
(ii) Which of the above metals react with steam?
(iii) Name the metal which reacts with hot water.
(iv) Arrange these metals in order of increasing reactivity. 
Answer :  
(i) Na 
(ii) Al, Zn, Fe 
(iii) Mg 
(iv) Na>Mg> Al > Zn > Fe > Cu 
 
Question. A student was given Mg, Zn, Fe, and Cu metals. He put each of them in dil HCl contained in different test tubes. Identify which of them
(i) will not displace H2 from dil HCl
(ii) forms a pale green substance
(iii) will give H2 with 5% HNO3
(iv) will be displaced from its salt solution by all other metals. 
Answer :  
(i) Cu 
(ii) Fe 
(iii) Cu 
(iv) Cu 
 
Question. A metal `X` is found in the form of filings which burns vigorously when sprinkle on flame. When these filings are treated with sulphur a black colured compound `Y` is formed which is not attracted by magnet. `X` reacts with dil HCl to liberate hydrogen gas. `X` reacts with steam to form `Z` along with hydrogen gas. Identify `X`, `Y`, and `Z`. Write the reaction involved. 
Answer :  
Fe + S  →   Fe S
`X` `Y`
Fe + HCl  →  FeCl2 +H2
3Fe(s) + 4H2-O(g)   →   Fe3-O-(s) + 4H2-(g)`Z` 
 
Question. A, B and C are 3 elements which undergo chemical reactions according to +following equations: 
a) A2O3 + 2B B2O3 + 2A 
b) 3CSO4 + 2B B2 (SO4)3 + 3C 
c) 3CO + 2A A2SO3 + 3C 
Answer of the following: 
i) Which element is most reactive? 
ii) Which element is least reactive? 
Answer :  
i) Most reactive element is B as it has replaced both A and C from their compounds. 
ii) Element C is least reactive as it has been replaced both by A and B. 
 
Question. An element X on reacting with O2 forms X2O.This Oxide dissolves in water and turns blue litmus paper red. Predict the nature of element whether it is a metal or a non metal. 
Answer :  The oxide is acidic in nature as it has turned blue litmus to red. Hence X is a non metal. 
 
QuestionAn element E combines with O2 to form an oxide E2O, which is a good conductor of electricity. Answer the following: 
i) How many electrons will be present in the outer most shell of E? 
ii) Write the formula of the compound formed when it combines with Chlorine.
Answer :  
i) Valency of the element E is 1.This means that it has only one electron in the valence shell. 
ii) E+ + Cl - ECl
Valency of Cl is 1 and Valency of E is also 1.Therefore the formula will be ECl.
Elements are classified broadly into two categories on the basis of properties:
Metals: Iron, Zinc, Copper, Aluminium etc.
Non – metals: Chlorine, Nitrogen, Hydrogen, Oxygen, Sulphur etc.
Apart from metals and non-metals some elements show properties of both metals and non – metals, e.g. Silicon, Arsenic, Germanium .They are called metalloids.
 

MORE QUESTIONS FOR PRACTICE

Q1. Name 2 metals which are neither ductile nor malleable.

Q2. What happens to the electrical conductivity of a metal when it is heated?

Q3. What is the nature of Al2O3?

Q4. An alloy of a metal contains Mercury. What will you call it?

Q5. What is the purpose of adding C to molten Iron?

Q6. Who am I?
a) Versatility is my name. There are more than 5 million compounds of me.
b ) Your teacher uses me, I am a metallic element found in chalk, limestone, marble etc.
c) Shocking? In one form I am a conductor whereas in another an insulator.
d) ‘Bang’. I am the element formed when H2 bomb explodes.

Q7. Which of the following is metal and non metal? (7)

Q8. Name one metal and one non metal element which are obtained on a large scale from sea water.

Q9. Zn is more electropositive than Fe. So it should get corroded faster than Fe. But it does not happen. Instead it is used to galvanize Iron. Explain why does it happen so?

Q10. The reaction of a metal X with Fe2O3 is highly exothermic and is used to join railway tracks. Identify metal X.Write the chemical equation of its reaction with Fe2O3.

Q11. Why do metals generally not evolve H2 gas when reacted with HNO3 ? Name 2 metals which liberate H2 gas with very dil. HNO3.

Q12. Name one metal each which is extracted by:
a) reduction with heat alone
b) reduction with C
c) reduction with Al.
d) electrolytic reduction.

Q13.a) A metal M is found in nature as MCO3.It is used in galvanizing Fe articles.
Name the Metal M.
b) How can metal M be obtained from its Carbonate Ore?

Q14.Explain how the following metals are obtained from their compounds by the reduction process.
a) Metal X which is low in the reactivity series.
b) Metal Y in the middle of reactivity series.
c) Metal Z which is high in the reactivity series.

Q15. Write the equations for the reactions of:
a) Iron with Steam
b) Calcium with Water.
c) Potassium with Water.

Q.16. Why Al metal cannot be obtained by the reduction of Al2O3 with Coke.

Q17 You cannot hold a piece of Na in your hand but you can eat Na ions in NaCl.Why?

Q18. Cinnabar is an ore of metal X.It exists in the lower order of the reactivity series.
Write down the reaction involved in it for the extraction of X.

Q19. Identify the acid which oxidizes H2 to H2O.

 
Comparison of physical and chemical properties of metals and non – metals:-
CBSE_Class_10_Science_Metal_And_Non_Metal_1
CBSE_Class_10_Science_Metal_And_Non_Metal_2
CBSE_Class_10_Science_Metal_And_Non_Metal_3
Properties of ionic compounds
 
1. Physical nature:solid and hard due to strong force of attraction. (generally brittle)
 
2. Melting point and boiling point:have high M.P and B.P, as large amount of heat energy is required to break strong ionic attraction.
 
3. Solubility: soluble in water and insoluble in kerosene and pertrol.
 
4. Conduction of electricity: ionic compounds in solid state-----does not conduct electricity.
 
Reason—Ions can not move due to rigid solid structure. Ionic compounds conduct electricity in molten state.
 
Reason-- Ions can move freely since the electrostatic forces of attraction between the oppositely charged ions are overcome due to heat.
 
Occurrence of metals.
CBSE_Class_10_Science_Metal_And_Non_Metal_4
Extraction of Metals based on their reactively. The varoius steps involved are as follows.
CBSE_Class_10_Science_Metal_And_Non_Metal_5
CBSE_Class_10_Science_Metal_And_Non_Metal_6
Reflining of Metals 
To obtain pure metal electrolytic reflining of metals is done.
 
SUGGESTED ACTIVITIES
1. Testing physical properties of metals 
2. Metals are good conductor of heat 
3. Metals are good conductor of electricity 
4. Testing chemical properties of metals 
5. To show properties of ionic compound 
6. Investigating the conditions under which ir on rusted.
 
 
HOTS QUESTIONS (SOLVED / UNSOLVED)
 
Question 1 a) What are amphoteric oxides? Choose the amphoteric oxides from amongst the following: Na2O, ZnO, Al2O3, CO2, H2O
b) Why is it that non metals do not displace hydrogen from dilute acid? 
Answer :  
a) The oxides which are acidic as well as basic in nature are called amphoteric oxides. ZnO and Al2O3are amphoteric oxides. 
b) Non metals can not loose electrons so that H+ ions become hydrogen gas. 
 
Question 2. What is anodizing? What is its use? 
Answer : The process of forming thick oxide layer of aluminium oxide that makes it resistant to further corrosion. 
 
Question 3. What is Aqua regia? What is its use? 
Answer :   It is a mixture of concentrated HCl and concentrated HNO3 in the ratio 3:1. It can dissolve gold and platinum. 
 

Metals And Non Metals

1. A metal is soft. It can be cut with a knife. Its salt is called is rock salt. The metal is kept in kerosene oil. Name the metal and the reason for storing in oil. (2)
 
2. A metal ‘X’ is highly malleable and ductile. Its foil is used for wrapping food materials. It is used for making transmission wires. Identify the metal and predict the nature of oxide formed by this metal. (1)
 
3. A yellow coloured powder ‘X’ is soluble in carbon di sulphide .It burns with a blue flame forming suffocating smelling gas which turns moist blue litmus red. Identify ‘X’ and give chemical reaction. Identify it is a metal or non metal. (2)
 
4. Royal water is prepared by mixing two acids. ’A’ and ‘B’ .It can dissolve gold and platinum. It is highly corrosive and fuming liquid. Identify ‘A’ and ‘B’. What is the ratio in which ‘A’ and ‘B’ are mixed? (2)
 
5. A metal ‘X’ is found in the form of filings burn vigorously when sprinkled on flame. When these filings are heated with sulphur, a black colored compound ‘Y’ is formed which is not attracted by a magnet. ’X’ reacts with dil. HCl to liberate hydrogen gas. ‘X’ reacts with steam to form to form ‘Z’ along with hydrogen gas. Identify ‘X’,’Y’ and ‘Z’ and write the chemical reactions involved. (5)
 
6. A reddish brown metal ‘X’ on heating forms a black coating of oxide’Y’on its surface. The metal does not react with dil.HCl and dil H2SO4. It reacts with hot conc.H2SO4 to give a pungent smelling gas similar to that produced by burning matchstick. The metal oxide reacts with dil.H2SO4 to form a blue solution. Identify ‘ X’,’Y’and ‘Z’. Write the chemical reactions involved. (3)
 
7. Why pure metal is always collected at cathode during electrolytic refining? (2)8. A girl has a hobby to collect coins of different countries. One day she observed the black coating on silver coins and green coating on copper ones. What is the reason? (2)
 
9. An ‘A’ element when is burnt produces a gas that turns lime water milky and when passed through moist blue litmus paper, it turned red. Identify ‘A’. (1)
 
10. Tarnished copper vessels are cleaned with lemon or tamarind juice. Explain why these substances are effective? (2)
Chapter 01 Chemical Reactions and Equations
CBSE Class 10 Science HOTs Chemical Reactions and Equations
Chapter 03 Metals and Non-Metals
CBSE Class 10 Science HOTs Metals and Non Metals
Chapter 05 Periodic Classification of Elements
CBSE Class 10 Science HOTs Periodic Classification of Elements
Chapter 08 How do the Organisms Reproduce
CBSE Class 10 Science HOTs Question How Do Organisms Reproduce
Chapter 10 Light Reflection and Refraction
CBSE Class 10 Science HOTs Reflection and Refraction
Chapter 13 Magnetic Effect of Electric Current
CBSE Class 10 Science HOTs Magnetic Effects of Electric Current
Chapter 16 Sustainable Management of Natural Resources
CBSE Class 10 Science HOTs Question Management of Natural Resources
More HOTs for Class 10 Science
CBSE Class 10 Science HOTs Question Bank

CBSE Class 10 Science Chapter 3 Metals and Non-Metals HOTS

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Chapter 3 Metals and Non-Metals HOTS Science CBSE Class 10

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Chapter 3 Metals and Non-Metals CBSE Class 10 HOTS Science

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CBSE HOTS Science Class 10 Chapter 3 Metals and Non-Metals

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