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Q.

An orange solid (X) on heating gives a colourless gas (Y) and only a green residue (Z).Gas (Y) on treatment with Mg produces a white solid substance:

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a

Mg3N2

b

MgO

c

Mg2O3

d

MgCl2

answer is A.

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Detailed Solution

NH42Cr2O7(X)→HeatAmm.dichromate (orange solidCr2O3Chromic oxides (Green residue)+N2colour less gas(Y)+ 4H2O          N2(Y)+Mg⟶Mg3N2(white)
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An orange solid (X) on heating gives a colourless gas (Y) and only a green residue (Z).Gas (Y) on treatment with Mg produces a white solid substance: