CBSE Class 10 Science Chemical reactions and equations Sure Shot Questions A

Question. In the equation, NaOH + HNO₃ → NaNO₃ + H₂O nitric acid is acting as
(A) an oxidizing agent
(B) an acid
(C) a nitrating agent
(D) a dehydrating agent
Answer. B

Question. Which of the following metal is protected by a layer of its oxide ?
(A) Copper
(B) Silver
(C) Iron
(D) Aluminium
Answer. D

Question. When copper turnings are added to silver nitrate solution, a blue colored solution is formed after some time. It is because, copper
(A) oxidizes silver from the solution
(B) forms a blue colored complex with AgNO₃
(C) is oxidized to Cu²⁺
(D) is reduced to Cu²⁺
Answer. C

Question. In the reaction, 2H₂S + SO₂ → 3S + 2H₂O
(A) H₂S has been oxidized
(B) SO₂ has been oxidized
(C) H₂S is the oxidizing agent
(D) SO₂ is the reducing agent
Answer. A

Question. In the reaction xPb(NO₃)₂ Heat-yPbO(s) + zNO₂(g) + O₂(g) Values of x, y and z respectively are
(A) 1, 1, 2
(B) 2, 2, 4
(C) 1, 2, 4
(D) 4, 2, 2
Answer. B

Question. In the balanced equation Na₂CO₃ + xHCl → 2NaCl + CO₂ + H₂O. The value of x is
(A) 1
(B) 2
(C) 3
(D) 4
Answer. B

Question. Which of the following statement is incorrect ?
(A) In oxidation, oxygen is added to a substance
(B) In reduction, hydrogen is added to a substance.
(C) Oxidizing agent is oxidized
(D) Reducing agent is oxidized
Answer. C

Question. Which of the statement about the following reaction is correct ?
ZnO + CO → Zn + CO₂
(A) ZnO is being reduced
(B) CO is being reduced
(C) CO₂ is being oxidized
(D) ZnO is being oxidized
Answer. A

Question. Which of the following chemical equations is an unbalanced one ?
(A) 2NaHCO₃ - Na₂CO₃ + H₂O + CO₂
(B) 2C₄H₁₀ + 12O₂ - 8CO₂ + 10H₂O
(C) 2Al + 6H₂O - 2Al(OH)₃ + 3H₂
(D) 4NH₃ + 5O₂ - 4NO + 6H₂O
Answer. B

Question. Which one of the following reaction will not take place ?
(A) Zn + FeSO₄ → ZnSO₄ + Fe
(B) 2 Al + 3 MgSO₄ → Al₂(SO₄)₃ + 3 Mg
(C) Fe + NiSO₄ → FeSO₄ + Ni
(D) Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 Ag
Answer. B

Question. Fill in the blank in the chemical equation : ……. + 4HNO₃ → Cu(NO₃)₂ + 2NO₂ + 2H₂O
(A) Cu
(B) 2Cu
(C) CuO
(D) 2CuO
Answer. A

Question. When lead nitrate reacts with potassium iodide, yellow precipitate of
(A) PbI₂ is formed
(B) KNO₃ is formed
(C) Pb(NO₃)₂ is formed
(D) PbIO₃ is formed
Answer. A

Question. When ferrous hydroxide reacts with hydrochloric acid, ….. and H₂O are produced
(A) FeCl₃
(B) FeCl₂
(C) FeCl₄
(D) FeCl
Answer. B

Question. Which of the following reactions involves the combination of two elements ?
(A) CaO + CO₂ → CaCO₃
(B) 4Na + O₂ → 2Na₂O
(C) SO₂ + 1/2 O₂ → SO₃
(D) NH₃ + HCl → NH₄Cl
Answer. B

Question. Symbol Δ used while representing some chemical changes stands for -
(A) light
(B) heat
(C) catalyst
(D) pressure
Answer. B

Question. In the balanced equation : a Fe₂O₃ + bH₂ → - cFe + dH₂O
The value of a, b, c, d are respectively –
(A) 1, 1, 2, 3
(B) 1, 1, 1, 1
(C) 1, 3, 2, 3
(D) 1, 2, 2, 3
Answer. C

Question. Which of the following statements is/are correct ?
(A) A chemical equation tells us about the substances involved in a reaction.
(B) A chemical equation informs us about the symbols and formulae of the substances involved in a reaction.
(C) A chemical equation tells us about the atoms or molecules of the reactants and products involved in a reaction.
(D) All the above
Answer. D

Question. Which of the following is a displacement reaction ?
(A) CaO + H₂O → Ca(OH)₂
(B) MgCO₃ → MgO + CO₂
(C) 2Na + 2H₂O → 2NaOH + H₂
(D) H₂ + Cl₂ → 2HCl
Answer. C

Question. Neutralization reaction is an example of
(A) exothermic reaction
(B) endothermic reaction
(C) oxidation
(D) none of these
Answer. A

Question. In the equation, a Al + bH₂SO₄ - c Al₂(SO₄)₃ + dH₂ a, b, c, d are respectively -
(A) 2, 3, 1, 1
(B) 2, 3, 1, 3
(C) 2, 3, 2, 3
(D) 2, 2, 3, 3
Answer. B

Question. aMg₃N₂ + bH₂O - cMg(OH)₂ + dNH₃. When the equation is balanced, the coefficients a, b, c, d respectively are -
(A) 1, 3, 3, 2
(B) 1, 6, 3, 2
(C) 1, 2, 3, 2
(D) 2, 3, 6, 2
Answer. B

Question. Rancidity can be prevented by
(A) adding antioxidants
(B) packaging oily food in nitrogen gas
(C) both A and B
(D) none of these
Answer. C

Question. When dilute hydrochloric acid is added to zinc pieces taken in a test tube
(A) no change takes place
(B) the color of the solution becomes yellow
(C) a pungent smelling gas gets liberated
(D) small bubbles of hydrogen gas appear on the surface of zinc pieces
Answer. D

Question. Plastic bags containing potato chips are filled with an antioxidant, known as
(A) oxygen
(B) nitrogen
(C) hydrogen
(D) carbon monoxide
Answer. B

Question. AgNO₃(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq). Above reaction is
(A) Precipitation reaction
(B) Double Displacement reaction
(C) Combination reaction
(D) A and B both
Answer. D

Question. Which of the following is a decomposition reaction ?
(A) NaOH + HCl → NaCl + H₂O
(B) NH₄CNO → H₂NCOONH₂
(C) 2KClO₃ → 2KCl + 3O₂
(D) H₂ + I₂ → 2HI
Answer. C

Question. Which of the following is a displacement reaction ?
(A) CaCO₃ → CaO + CO₂
(B) CaO + 2HCl → CaCl₂ + H₂O
(C) Fe + CuSO₄ → FeSO₄ + Cu
(D) NaOH + HCl → NaCl + H₂O
Answer. C

Question. Which of the following is not a decomposition reaction ?
(A) CaCO₃ → CaO + CO₂
(B) 2KClO₃ → 2KCl + 3O₂
(C) Digestion of food in body
(D) H₂ + Cl₂ → 2HCl
Answer. D

Question. Fe₂O₃ + 2Al → Al₂O₃ + 2Fe
The above reaction is an example of
(A) Combination reaction
(B) Double displacement reaction
(C) Decomposition reaction
(D) Displacement reaction
Answer. D

Question. Reaction of phosphorus and oxygen is an example of
(A) oxidation
(B) reduction
(C) rancidity
(D) none of these
Answer. A

VERY SHORT ANSWER TYPE QUESTIONS

1. How are chemical reactions expressed in the shortest way?

2. What is the type of reaction in which the reactant gives simpler products?

3. What is the type of reaction in which two or more reactants combine to a give a single product?

4. In which type of reaction does an exchange of partners take place?

5. Why are chemical equations balanced?

6. What symbol is used to indicate a solution made in water?

7. What type of reaction does occur during the digestion of food inside our body?

8. What type of reaction is represented by the following equation?

     CaCO₃ → CaO + CO₂

9. What type of reaction does occur when silver bromide is exposed to sunlight?

10. A solution of a substance is used for white-washing. Name the substance with its formula.

11. Name the type of reaction which is represented by the following equations:

                Fe₂O₃ + 2Al → Al₂O₃ + 2Fe

12. Balance the following equation using state symbols: Fe + HCl → FeCl₂ + H₂.

13. Express the following statement in the form of a balanced chemical equation: “Sodium reacts with water to form sodium hydroxide and drogen”.

14. Write the balanced chemical equation for the reaction that occurs between aluminium hydroxide and sulphuric acid forming aluminium sulphate and water.

15. What type of reaction does occur when ammonia is allowed to react with hydrogen chloride?

16. Name the type of reaction involved when a zinc plate is dipped in a solution of copper sulphate?

17. In the reaction, CuO(s) + H₂(g) → Cu(s) + H₂O(l). Pick out the following:

(i) the substance which is oxidised

(ii) the substance which is reduced

(iii) the oxidizing agent

(iv) the reducing agent

18. What chemical reaction is involved in the corrosion of iron?

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