18 g of glucose, C₆H₁₂O₆, is dissolved in 1 kg of water in a saucepan. The temperature at which water boil at 1.013 bar is-

(K_b for water is 0.52 K kg mol^-1)

1. 383.202 K

2. 373.202 K

3. 363.202 K

4. 393.202 K

The boiling point of benzene is 353.23 K. When 1.80 g of a non-volatile solute was dissolved in 90 g of benzene, the boiling point is raised to 354.11 K. The molar mass of the solute is-

K_b for benzene is 2.53 K kg mol^–1

1. 55 g mol^–1
2. 64 g mol^–1
3. 58 g mol^–1  
4. 68 g mol^–1

1.00 g of a non-electrolyte solute dissolved in 50 g of benzene lowered the freezing point of benzene by 0.40 K. The freezing point depression constant of benzene is 5.12 K kg mol^–1. The molar mass of the solute is-

1. 245 g mol^-1
2. 256 g mol^-1
3. 264 g mol^-1
4. 274 g mol^-1