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Assignment for Class 12 Chemistry Unit 06 General Principles And Processes Of Isolation Of Elements
Class 12 Chemistry students should refer to the following printable assignment in Pdf for Unit 06 General Principles And Processes Of Isolation Of Elements in Class 12. This test paper with questions and answers for Class 12 Chemistry will be very useful for exams and help you to score good marks
Unit 06 General Principles And Processes Of Isolation Of Elements Class 12 Chemistry Assignment
Question. An alkaline earth metal.
(A) Potassium
(B) Calcium
(C) Lead
(D) Copper
Answer: B
Question. Which of the following metallic oxides cannot be reduced by normal reducing agents ?
(A) Magnesium oxide
(B) Copper(II) oxide
(C) Zinc oxide
(D) Iron(III) oxide
Answer: A
Question. When a metal atom becomes an ion
(A) it loses electrons and is oxidized
(B) it gains electrons and is reduced
(C) it gains electrons and is oxidized
(D) it loses electrons and is reduced
(Choose the correct answer from the choices A, B, C and D)
Answer: A
Question. Brass is an alloy of :
(A) Copper and tin
(B) Copper and zinc
(C) Zinc and lead
(D) Lead and tin
Answer: B
Question. The metal oxide which can react with acid as well as alkali is :
(A) Silver oxide
(B) Copper (II) oxide
(C) Aluminium oxide
(D) Calcium oxide
Answer: C
Question. Select the correct answer from A, B, C and D – The property which is true for metals.
(A) Metals are good conductors of electricity
(B) Metals are malleable and ductile
(C) Non-polar covalent compounds are formed from metals.
(D) Metals have 1, 2 or 3 valence electrons.
Answer: C
Question. The amphoteric metallic oxide is
(A) Calcium oxide
(B) Barium oxide
(C) Zinc oxide
(D) Copper (II) oxide
Answer: C
Question. The metals zinc and tin are present in the alloy :
(A) Solder
(B) Brass
(C) Bronze
(D) Duralumin.
Answer: C
Question. Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as :
(A) smelting
(B) ore dressing
(C) calcination
(D) bessemerisation
Answer: C
Question. Aluminium powder is used in thermite welding because,
(A) it is a strong reducing agent
(B) it is a strong oxidising agent
(C) it is corrosion resistant
(D) it is a good conductor of heat.
Answer: A
Question. The main ore used for the extraction of iron is :
(A) Haematite
(B) Calamine
(C) Bauxite
(D) Cryolite
Answer: A
Question. Select which is not an alloy of copper :
(A) Brass
(B) Bronze
(C) Solder
(D) Duralumin.
Answer: C
Question. Select the correct answer from A, B, C and D :kThe two main metals in Bronze are :
(A) Copper and zinc
(B) Copper and lead
(C) Copper and nickel
(D) Copper and tin
Answer: D
Question. The process does not involve a catalyst is :
(a) Haber process
(b) Contact process
(c) Thermite process
(d) Ostwald process
Question. Which one is malachite from the following?
(a) CuCO3.Cu(OH)2
(b) CuFeS2
(c) Cu(OH)2
(d) Fe3O4
Question. Identify the incorrect statement.
(a) The scientific and technological process used for isolation of the metal from its ore is known as metallurgy.
(b) Minerals are naturally occurring chemical substances in the earth’s crust.
(c) Ores are minerals that may contain a metal.
(d) Gangue is an ore contaminated with undesired materials.
Question. Chief ore of Al is :
(a) cryolite
(b) bauxite
(c) feldspar
(d) kaolin
Question. “Metals are usually not found as nitrates in their ores.” Out of the following two (I and II) reasons which is/are true for the above observation?
I. Metal nitrates are highly unstable.
II. Metal nitrates are highly soluble in water.
(a) I is false but II is true.
(b) I is true but II is false.
(c) I and II are true.
(d) I and II are false
Question. Which one of the following is a mineral of iron?
(a) Malachite
(b) Cassiterite
(c) Pyrolusite
(d) Magnetite
Question. Froth floatation is a process of:
(a) Oxidation
(b) Reduction
(c) Refining
(d) Concentration
Question. Cassiterite is an ore of
(a) Sb
(b) Ni
(c) Mn
(d) Sn
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CBSE Class 12 Chemistry Unit 06 General Principles And Processes Of Isolation Of Elements Assignment
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