For an AB type ionic substance,which ratio of | vedclass

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(D) For an $AB$ type ionic substance,the van't Hoff factor $i$ is given by $i = 1 + \alpha$,where $\alpha$ is the degree of dissociation. Since $0 \le

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$5 : 2$

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(D) For an $AB$ type ionic substance,the van't Hoff factor $i$ is given by $i = 1 + \alpha$,where $\alpha$ is the degree of dissociation. Since $0 \leq \alpha \leq 1$,the value of $i$ ranges from $1$ to $2$. The ratio of theoretical molecular mass $(M_{th})$ to experimental molecular mass $(M_{exp})$ is equal to the van't Hoff factor $i$ $(i = M_{th} / M_{exp})$. Therefore,the ratio $M_{th} / M_{exp}$ must be in the range $[1, 2]$. Among the given options,$5/2 = 2.5$,which is greater than $2$. Thus,$5 : 2$ is not a consistent ratio.

For an $AB$ type ionic substance,which ratio of theoretical to experimental molecular mass is not consistent?

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