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Question

Which of the acid is required for the laboratory preparation of nitric acid?


A

Sodium nitrate or potassium nitrate and concentrated sulphuric acid

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B

Sodium nitrite or potassium nitrite and dilute sulphuric acid

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C

Sodium nitrate or potassium nitrite and concentrated hydrochloric acid

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D

Sodium nitrate or potassium nitrite and dilute hydrochloric acid

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Solution

The correct option is A

Sodium nitrate or potassium nitrate and concentrated sulphuric acid


Nitric acid is produced in the laboratory by heating potassium nitrate and concentrated sulphuric acid.
KNO3 + H2SO4 KHSO4 + HNO3
Nitric acid is a volatile acid. In order to displace it from a salt, a non-volatile salt like concentrated sulphuric acid is used.


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