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Question

X+HNO3Y+NO2+H2O+S, Y + Ammonium molybdate yellow ppt.
Identify X :

A
As2S5
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B
Sb2S5
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C
SnS2
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D
CdS
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Solution

The correct option is A As2S5
The reaction is as follows:
As2S5(X)+10HNO32H3AsO4+10NO2+2H2O+5S
H3AsO4(Y)+12(NH4)2MoO4 (Ammonium molybdate) +21HNO3(NH4)3AsO4.12MoO3 (Yellow ppt.) +21NH4NO3+12H2O

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