Question

which of the following solutions will have the lowest vapour pressure 1)0.1M glucose 2)0.1M NaCl. 3)0.1M MgCl2. 4)0.1M Al2 (SO4)3

Answer 1

the answer is option 2 )-0.1M

Answer 2

2 )-0.1M  is the  right  option.

You  can proper formula offer the all resources which colligative and more the no. of solute particles and concentration of solution more is the lowering  in the case of your NaCl within the2 ions whereas BaCl2 into 3 ions as

NaCl (0.1M) —-> Na+(0.1M) + Cl-(0.1M) [0.2M]  and

BaCl2 (0.1M) —→ Ba+2 (0.1M) + 2Cl-(0.2M) [0.3M]