Equilibrium Question 251

Question: If dissociation for reaction, $ PCl_5 $ ⇌ $ PCl_3+Cl_2 $ Is 20% at 1 atm. pressure. Calculate $ K_{c} $ [Kerala (Med.) 2003]

Options:

A) 0.04

B) 0.05

C) 0.07

D) 0.06

Show Answer

Answer:

Correct Answer: B

Solution:

$ K_{c}=\frac{[PCl_3][Cl_2]}{[PCl_5]}=\frac{[ \frac{20}{100} ]\times [ \frac{20}{100} ]}{[ \frac{80}{100} ]} $

$ =\frac{0.2\times 0.2}{0.8}=\frac{0.04}{0.8}=0.05 $



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