Question

What happens when a solution of an acid is mixed with a solution of base in a test tube?

(i) The temperature of the solution increases

(ii) The temperature of the solution decreases

(iii) The temperature of the solution remains the same

(iv) Salt formation takes place

• A. (a) only (iv)
• B. (b) (i) and (iii)
• C. (c) (ii) and (iii)
• D. (d) (i) and (iv)

Answer 1

The correct option is D

(d) (i) and (iv)

Part 1 Explanation for the correct option

Correct option is D

1. Salt and water are made by combining acid and base.
2. This process is exothermic in nature, releasing heat known as heat of neutralisation, causing a temperature increase.
3. When acid is given to any base, the temperature of the acid-base reaction rises, making these reactions explosive in nature.

Part 2 Explanation for the incorrect options

Option A.

The temperature of the solution doesn't increase, instead it releases heat. So, the option is incorrect.

Option B.

Based on bond-forming a little decrease might take place or no decrease. So, the option is incorrect.

Option C.

The temperature cannot be neutral because releases heat. So, the option is incorrect.

Therefore, Salt is formed by combining acid and base and the temperature also increases.