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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

H2S

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B

NO2

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C

N2O

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D

O2

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Solution

The correct option is B

NO2


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

2Cu(NO3)22CuO+O2+4NO2

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.


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