Question

Copper nitrate is heated to form copper oxide, gas X and gas Y. Gas X is colourless and neutral to litmus. Gas Y is brown in colour having an irritating odour and non-combustible. Gas Y turns green acidified ferrous solution brown. Gas Y is:

• A. $H_{2}S$
• B. $N{O}_2$
• C. $N_{2}O$
• D. $O_2$

Answer 1

The correct option is B

$N{O}_2$

Copper nitrate is heated to form copper oxide, oxygen and nitrogen dioxide gas.

$2Cu(N{O}_3{)}_2\to 2CuO+O_2+4N{O}_2$

Oxygen gas is colourless and neutral to litmus. Nitrogen dioxide gas is brown in colour having an irritating odour and non-combustible. Nitrogen dioxide gas turns green acidified ferrous solution brown.