Question

In the laboratory preparation of nitric acid, it can be obtained below ${200}^{\circ }$C or above ${200}^{\circ }$C, but the lower temperature is preferred. Which of the following reason(s) is /are correct?

i. The glass apparatus may break at a higher temperature.

ii. At lower temperature, potassium or sodium sulphate is formed, which cannot be easily removed from the apparatus.

• A. i only
• B. ii only
• C. i and ii
• D. Both of the above reasons are wrong.

Answer 1

The correct option is A

i only

The lower temperature is preferred due to the following reasons:

i. The glass apparatus may break at a higher temperature.

ii.At higher temperature, potassium or sodium sulphate is formed, which cannot be easily removed from the apparatus.

iii.Some quantity of nitric acid gets decomposed at a higher temperature.