A solution containing 30 g of non-volatile solute in 90 g of water has a vapour pressure of 2.8 kPa at 298 K. Further, 18 g of water is then added to the solution and the new vapour pressure becomes 2.9 kPa at 298 K.

The molar mass of the solute will be :

1.  23 g mol−1

2.  34 g mol−1

3.  15 g mol−1

4.  46 g mol−1

Subtopic:  Relative Lowering of Vapour Pressure |
Level 3: 35%-60%
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NEET 2026 - Target Batch - Vital
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An open beaker of water in equilibrium with water vapour is in a sealed container. When a few grams of glucose are added to the beaker of water, the rate at which water molecules :
 
1. Leaves the vapour increases
2. Leaves the solution increases
3. Leaves the solution decreases
4. Leaves the vapour decreases
Subtopic:  Relative Lowering of Vapour Pressure |
Level 4: Below 35%
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