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Q.

Given for the following equilibrium taking place in 1 L flask at 300 K.PCl5(g)  ⇋  PCl3(g)  +  Cl2(g);   KC=4Thus, degree of dissociation of PCl5(g)  is

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a

22 -1

b

22 -1

c

22 +1

d

-22 +1

answer is A.

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Detailed Solution

PCl5(g)  ⇋  PCl3(g)  +  Cl2(g)LetInitial moles          1                     0                  0At equilib.          (1 - x)                 x                  xActive masses   1-x1             x1                 x1 mil   L-1KC=  PCl3   Cl2PCl5 = x21-x = 4x2+4x-4=0x=-4+16+162  =  -4+422x=22 -1
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