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Ammonium sulphide and ammonium selenide ...

Ammonium sulphide and ammonium selenide on healing dissociates as
`(NH_(4))_(2) S_(s) Leftrightarrow 2NH_(3(g)) +H_(2)S_(g)), K_(p_(1))=9 xx 10^(-3)" atm"^3`
`(NH_(4))_(2) Se_(s) Leftrightarrow 2NH_(3(g)) +H_(2)Se_(g), K_(p_(2))=4.5 xx 10^(-3)" atm"^3`
The total pressure over the solid mixture al equilibrium is

A

0.15 atm

B

0.3 atm

C

0.45 atm

D

0.6 atm

Text Solution

Verified by Experts

The correct Answer is:
C
`(NH_(4))_(2) S_(s) Leftrightarrow underset(2p)(2NH_(3(g)) +underset(p)(H_(2)S_(g))`
`(NH_(4))_(2) Se_(s) Leftrightarrow underset(2q)(2NH_(3(g))+underset(q)(H_(2)Se_(g))`
`K_(p_(1))=p_(NH_(3))^2 .p_(H_(2)S)=(2p+2q)^2 .p=9.0 xx 10^(-3)`
`K_(P_(2))=p_(NH_(3))^2 .p_(H_(2)Se)=(2p+2q)^2 .q=4.5 xx 10^(-3)`
`p/q=2 rArr p=2q `
`K_(p_(1))=(2p+p)^2 .p=9.0 xx 10^(-3)`
Total pressure `=2p+2q+p+q=3p+3q`
`=3 xx 0.1 +3 xx 0.05=0.45 atm`
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