By adding a non-volatile salute into a solution vapour pressure is reduces.

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lowering in vapour pressure occur by adding a non volatile solute into a solution
$P^{o}$ $\to$ vapour pressure of pure liquid
$P$ $\to$ vapour pressure of solution
$P^{o} - P$ $\to$ lowering in vapour pressure
$\frac{P^{o} - P}{P^{o}}$ $α$ $X_{b}$
$X_{b}$ $\to$ is mole fraction of solute.

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By adding a non-volatile salute into a solution vapour pressure is reduces.

lowering in vapour pressure occur by adding a non volatile solute into a solution Po → vapour pressure of pure liquid P → vapour pressure of solution Po−P → lowering in vapour pressurePo−PPo α XbXb → is mole fraction of solute.

lowering in vapour pressure occur by adding a non volatile solute into a solution
$P^{o}$ $\to$ vapour pressure of pure liquid
$P$ $\to$ vapour pressure of solution
$P^{o} - P$ $\to$ lowering in vapour pressure
$\frac{P^{o} - P}{P^{o}}$ $α$ $X_{b}$
$X_{b}$ $\to$ is mole fraction of solute.