Class 10 Science Chemical Reactions and Equations Objective Questions

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1. Q1. Rusting of iron is an example of

   (A)Reduction(B)Oxidation(C)Neutralisation(D)Decomposition

2. Q2. CaO + H₂O → Ca(OH)₂ is a

   (A)Decomposition reaction(B)Combination reaction(C)Displacement reaction(D)Double displacement reaction

3. Q3. Which gas is released when zinc reacts with dilute sulphuric acid?

   (A)Oxygen(B)Carbon dioxide(C)Hydrogen(D)Nitrogen

4. Q4. To prevent rancidity, chips packets are flushed with

   (A)Oxygen(B)Nitrogen(C)Hydrogen(D)Chlorine

5. Q5. Fe + CuSO₄ → FeSO₄ + Cu is an example of

   (A)Combination(B)Decomposition(C)Displacement(D)Neutralisation

6. Q6. Decomposition of silver chloride in sunlight is a

   (A)Thermal decomposition(B)Photolytic decomposition(C)Electrolytic decomposition(D)Combination