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MCQ Questions for Class 10 Science Acids Bases and Salts with Answers Class 10 Science MCQs Chapter 2 Acids Bases and Salts 1. What happens when a solution of an acid is mixed with a solution of a base in a test tube? (i) Temperature of the solution decreases (ii) Temperature of the solution increases (in) Temperature of the solution remains the same (iv) Salt formation takes place (a) (i) and (iv) (b) (i) and (iii) (c) (ii) only (d) (ii) and (iv) Answer Answer: d 2. When hydrogen chloride gas is prepared on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to (a) absorb the evolved gas (b) moisten the gas (c) absorb moisture from the gas (d) absorb Cl – ions from the evolved gas Answer/ Explanation Answer: c Explaination: Reason: Guard tube drys (absorbs water) from calcium chloride on a humid day. 3. Which one of the following salts does not con-tain water of crystallisation? (a) Blue vi