For which of the following solutes the van't Hoff factor is not greater than one?

N a {N O}_{3}

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B a {C l}_{2}

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K_{4} [F e {(C N)}_{6}]

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{N H}_{2} C O {N H}_{2}

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Solution

The correct option is D ${N H}_{2} C O {N H}_{2}$
${N H}_{2} {C O N H}_{2} \to$ urea
urea is a non-electrolyte and for non-electrolytes $i = 1$
$i = 1 - α + n α$
$i = 1$ { $α = 0$ for non-electrolytes}

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