Question

In laboratory method of preparation,temperature is maintained ${200}^{0}C$ because,

• A. To avoid nitric acid from decomposing at greater temperature
• B. Since Conc.$H_{2}S{O}_4$ is volatile ,it may explode.
• C. To avoid glass apparatus from breaking at high temperature
• D. To avoid sodium or potassium sulphate sticking to walls of apparatus at higher temperature.

Answer 1

Answer: (A), (C), (D)

The correct options are
A

To avoid nitric acid from decomposing at greater temperature

C

To avoid glass apparatus from breaking at high temperature

D

To avoid sodium or potassium sulphate sticking to walls of apparatus at higher temperature.

Temperature is maintained ${200}^{0}C$ because ,

To avoid nitric acid from decomposing at greater temperature, and Since we will be using glass apparatus in laboratory the apparatus may break at high temperatur and also potassium or sodium sulphate is formed which will stick to the walls for the flask and is not that easy to remove.