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Two moles of PCl5 are heated in a closed...

Two moles of `PCl_5` are heated in a closed vessel of 2 litre capacity. When the equilibrium is attained, 40% of it has been found to be dissociated. What is `K_c` in mol/dm`""^3? `

A

0.532

B

0.267

C

0.133

D

0.174

Text Solution

Verified by Experts

The correct Answer is:
B
`"Initial conc. "("mol L"^(-1)) underset(1)(PCl_(5)) Leftrightarrow underset(0)(PCl_(3))+underset(0)(Cl_2)`
At equilibrium `"0.6 0.4 0.4"`
`K_(c)=([PCl_3] [Cl_2])/([PCl_5])=(0.4 xx 0.4)/(0.6)=0.267`
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