In the laboratory preparation of nitric acid from - $K N O_{3}$ or $N a N O_{3}$ , on the addition of conc. sulphuric acid and copper in the prepared nitric acid give _____________ .

brown gas

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reddish brown gas

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yellow gas

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blue gas

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Solution

The correct option is B reddish brown gas
On addition of conc. sulphuric acid and copper in prepared nitric acid then $N O_{2}$ gas is released which is reddish brown in colour.

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