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Question

In the laboratory preparation of nitric acid, it can be obtained below 200C or above 200C, 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.

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


  1. i only

  2. ii only

  3. i and ii

  4. Both of the above reasons are wrong.


Solution

The correct option is D

Both of the above reasons are wrong.


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.

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