RRB RPF RPSF SI and CONS Model Papers 9 with solutions

Question : 109 of 120

Marks: +1, -0

Which among the following is added to commercial nitric acid to make it coloured ?

Carbon dioxide
Sulphur dioxide
Coloured impurities
Nitrogen dioxide

Solution:

(4) Pure nitric acid is a colorless fuming liquid with a pungent odor. Nitric acid obtained in laboratory is slightly yellow due to the dissolution of nitrogen dioxide which is produced due to thermal decomposition of a portion of HNO

_{3}

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