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  4. The vapour pressure will be lowest for:

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Q. The vapour pressure will be lowest for:

Rajasthan PMTRajasthan PMT 2006

Solution:

Vapour pressure of a solvent is lowered by the presence of solute in it. Lowering in vapour pressure is a colligative properly i.e. , it depends on the no. of particles present in the solution. $ Cu(NO_3)_2$ give the maximum no. of ions (i.e.,$3$) so it causes the greatest lowering in vapour pressure of water.