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A white crystalline solid (A) on boiling...

A white crystalline solid (A) on boiling with caustic soda solution gave a gas (B) which when passed through an alkaline solution of `K_(2) [HgI_(4)]` gave a brown precipitate. The substance (A) on heating gave a gas (X) which rekindled a glowing splinter but does not give brown fumes with nitric oxide. The gas (X) is:

A

`NH_(3)`

B

`O_(2)`

C

`O_(3)`

D

`N_(2)O`

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