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If relative decrease in vapour pressure is 0.4 for a solution containing 1 mol NaCl in 3 mol of `H_(2)O`, then % ionization NaCl is

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If relative decrease in vapour pressure is 0.4 for a solution containing 1 mol NaCl in 3 mol of `H_(2)O`, then % ionization NaCl is
A. `60%`
B. `50%`
C. `100%`
D. `40%`
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1 Answer

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Correct Answer - C
`RLVP=("i"n_(Nacl))/("i"n_(naCl)+n_(H_(2)o)`
`0.4=("i")/(i+3)`
so `i=2`
`because i=1+alpha` so `alpha=1` or `100%`
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