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Question

For the reaction PCl5 (g) PCl3 (g) + Cl2 (g) if we start with only a moles of PCl5
PCl5PCl3Cl2(g)Moles t=0a00Moles At Eq.a(1α)aαaα
α is called the degree of dissociation - True or false?


A

True

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B

False

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Solution

The correct option is B

False


The degree of dissociation of a substance is the fraction of the substance present in the dissociated form. The equilibrium constant can be expressed in terms of the degree of dissociation (α) of the substance. In other words, it is the ratio of amount of substance dissociated at equilibrium to the amount of substance initially present. Consider the reaction

reaction PCl5 (g) PCl3 (g) + Cl2 (g)

PCl5PCl3Cl2(g)Moles t=0a00Moles At Eq.a(1α)aαaα
of PCl5 dissociated = aα { each mole of PCl5 breaks exactly into one mole of PCl3 and one mole ofCl2}

Degree of dissociation


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