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Q.

If relative decrease in vapour preasure is 0.4 for a solution containing 1mol NaCl  in 3 mol H2O, NaCl is...... percent ionised :

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a

40%

b

50%

c

60%

d

100%

answer is C.

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Detailed Solution

0.4=i×1i×1+3⇒i=2=1+α or α=1

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