The system PCl5(g)⇌PCl3(g)+Cl2(g) attains equilibrium. If the equilibrium concentration of PCl3(g) is doubled, the concentration of Cl2(g) would become:
A
14 its original value
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B
12 its original value
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C
twice its original value
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D
unpredictable
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Solution
The correct option is D unpredictable PCl5⇌PCl3+Cl2 If the concentration of PCl3 is doubled, it only predicts, that reaction will proceed backward. (Le-Chatlier's principle). So the concentration of Cl2, is unpredictable.