Q.

Vapour density of PCl5 is 104.16 but when heated to 230oC its vapour density is reduced to 62. The degree of dissociation of PCl5 at this temperature will be

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a

6.8%

b

68%

c

46%

d

60%

answer is B.

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Detailed Solution

Repeatn = 2D = 104.16d = 62Percentage dissociation of PCl5 = 0.68×100 =68%
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Vapour density of PCl5 is 104.16 but when heated to 230oC its vapour density is reduced to 62. The degree of dissociation of PCl5 at this temperature will be