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An orange solid (A) on heating gives a g...

An orange solid (A) on heating gives a green residue (B), a colourless gas (C ) and water vapours. The dry gas (C ) on passing over heated Mg gave a white solid (D). (D) on reaction with water gave a gas (E) which formed black preciptate with mercurous nitrate solution.
The green residue (B) is :

A

amphoteric in nature.

B

used as green pigment.

C

used in fire crackers to impart the red colour.

D

(A) and (B) both.

Text Solution

Verified by Experts

The correct Answer is:
D
`B=Cr_(2)O_(3)`.
`underset((A))((NH_(4))_(2))Cr_(2)O_(7)to underset((C))(N_(2))+underset((B))(Cr_(2)O_(3))+4H_(2)O`
`3Mg+N_(2)tounderset((D))(Mg_(3))N_(2)`
`Mg_(3\\)N_(2)+6H_(2)Oto3Mg(OH)_(2)+2NH_(3)(E)`
`Hg_(2)(NO_(3))_(2)+NH_(3) to`
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