Set-1 Set-2 Set-3 Set-4 Set-5

Set 1

1. Some crystals of copper sulphate were dissolved in water. The color of the solution obtained would be:

(a) Green
(b) Red
(c) Blue
(d) Brown

2. When dilute HCl 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 H₂ gas appear on the surface of zinc pieces

3. PbS reacts with ozone (O₃) and forms PbSO₄. As per the balanced equation, molecules of ozone required for every one molecule of PbS are:

(a) 4
(b) 3
(c) 2
(d) 1

4. Chemically, rust is:

(a) Hydrated ferrous oxide
(b) Hydrated ferric oxide
(c) Only ferric oxide
(d) None of these

5. Which of the following reactions is not correct?

(a) Zn + CuSO₄ ⟶ ZnSO₄ + Cu
(b) 2 Ag + Cu(NO₃)₂ ⟶ 2 AgNO₃ + Cu
(c) Fe + CuSO₄ ⟶ FeSO₄ + Cu
(d) Mg + 2 HCl ⟶ MgCl₂ + H₂

6. Copper displaces which of the following metals from its salt solution?

(a) Zinc (from ZnSO₄)
(b) Iron (from FeSO₄)
(c) Silver (from AgNO₃)
(d) Nickel (from NiSO₄)

7. In an electric cell where electrolysis is carried out, the anode has:

(a) Positive charge
(b) Negative charge
(c) Connected to the negative terminal of the battery
(d) None of these is correct

8. The reaction H₂ + Cl₂ ⟶ 2 HCl represents:

(a) Oxidation
(b) Reduction
(c) Combination
(d) Decomposition

9. In the reaction PbO + C ⟶ Pb + CO:

(a) C acts as a oxidizing agent
(b) C acts as a reducing agent
(c) PbO is oxidized
(d) The reaction does not represent a redox reaction

10. A substance which oxidizes itself and reduces others is known as:

(a) Oxidizing agent
(b) Reducing agent
(c) Both (a) and (b)
(d) None of these
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