Van't Hoff factor of 40% dissociated CH3COOH solution is

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1.0040

0.140

1.04

1.4

answer is D.

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Detailed Solution

n=2 forMono basic acids….HCl, HNO3, HCOOH, CH3COOH etc;Mono acidic bases….MOH (M= monovalent cation), NH4OH etc;Monovalent metal halides…..MX(NaX, KX etc) ;Bivalent metal sulphates and carbonates…..MSO4(MgSO4, CaSO4 etc), MCO3(MgCO3, CaCO3 etc) ;They all are classified as ‘AB’ type electrolytes…..AB ⇌An++Bn- ; n=2 Van't Hoff factor, i = 1-α+nα ;when n= 2 …Van't Hoff factor, i = 1+α ; α= Degree of ionization (or) dissociation ;Ex ; For 5% ionized ‘AB’ α=5100= 0.05 ;0.1, 0.15, 0.2, 0.25, 0.3…..for 10%, 15%, 20%, 25%, 30% ionized ‘AB’α for x% ‘AB’ = x100;

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