Common Chemical Reactions in Daily Life MCQs

1. Which chemical reaction causes iron to rust?
(A) Combustion
(B) Decomposition
(C) Oxidation
(D) Neutralization

2. Which gas is released when vinegar reacts with baking soda?
(A) Oxygen
(B) Carbon dioxide
(C) Nitrogen
(D) Hydrogen

3. Digestion in the stomach involves which type of reaction?
(A) Physical change
(B) Endothermic reaction
(C) Exothermic reaction
(D) Enzymatic chemical reaction

4. What kind of reaction occurs when milk turns sour?
(A) Oxidation
(B) Fermentation
(C) Combustion
(D) Sublimation

5. Which of the following is a neutralization reaction?
(A) Acid + Base → Salt + Water
(B) Metal + Acid → Salt + Hydrogen
(C) Acid + Metal oxide → Salt + Water
(D) Salt + Water → Acid + Base

6. Burning of a candle is an example of:
(A) Physical change only
(B) Chemical change only
(C) Both physical and chemical changes
(D) Neither physical nor chemical change

7. What type of reaction occurs during respiration in humans?
(A) Endothermic oxidation
(B) Exothermic oxidation
(C) Neutralization
(D) Sublimation

8. Which daily process involves a redox reaction?
(A) Freezing water
(B) Boiling milk
(C) Bleaching clothes
(D) Filtering juice

9. Which chemical reaction is responsible for the fizz in soft drinks?
(A) Combustion
(B) Neutralization
(C) Carbonation
(D) Sublimation