Chemistry questions
29404 published questions with worked solutions.
- Which one of the following is the expression of Raoult's law? (p = vapour pressure of pure solvent, p_s = vapour pressure of the...
- The vapour pressure of benzene at 80^ is lowered by 10 mm by dissolving 2g of a non-volatile substance in 78 g of benzene. The...
- The relative lowering of vapour pressure produced by dissolving 71.5 g of a substance in 1000 g of water is 0.00713. The...
- Benzene and toluene form nearly ideal solutions. At 20^ the vapour pressure of benzene is 75 torr and that of toluene is 22 torr....
- The vapour pressure of a solvent decreased by 10 mm of mercury when a non-volatile solute was added to the solvent. The mole...
- The rise in the boiling point of a solution containing 1.8 gram of glucose in 100g of a solvent is 0.1^ . The molal elevation...
- When a substance is dissolved in a solvent, the vapour pressure of solvent decreases. It brings
- If 0.15g of a solute dissolved in 15g of solvent is boiled at a temperature higher by 0.216^ than that of the pure solvent. The...
- The vapour pressure of CCl_4 at 25^ is 143mm of Hg. 0.5gm of a non-volatile solute (mol. Wt.=65) is dissolved in 100ml CCl_4....
- The molal elevation constant is the ratio of the elevation in B.P to
- Elevation in boiling point was 0.52^ when 6gm of a compound X was dissolved in 100gm of water. Molecular weight of X is (K_b for...
- The elevation of boiling point method is used for the determination of molecular weight of
- The molal boiling point constant for water is 0.513^ kg mol^ -1 . When 0.1 mole of sugar is dissolved in 200ml of water, the...
- An aqueous solution containing 1g of urea boils at 100.25^ . The aqueous solution containing 3g of glucose in the same volume...
- Which of the following statement is correct for the boiling point of solvent containing a dissolved solid substance ?
- Azotropic mixtures are
- A liquid is in equilibrium with its vapour at its boiling point. On the average the molecules in the two phases have equal
- Azotrops are
- The elevation in boiling point for one molal solution of a solute in a solvent is called
- The unit of molal boiling point elevation constant is