General
✓✗A soda water bottle when opened produces bubbles because
- CO2 is formed by a reaction on opening
- water starts boiling
- the partial pressure of CO2 above the liquid falls, so its solubility decreases
- temperature increases on opening
General
✓✗The van't Hoff factor for a 100% dissociated solution of [Co(NH3)6]Cl3 is
- 6
- 10
- 4
- 3
General
✓✗Which of the following pairs of concentration terms are both independent of temperature?
- Molarity and molality
- Molarity and mass by volume percentage
- Molality and mole fraction
- Mole fraction and molarity
General
✓✗An antifreeze solution is prepared from 222.6 g of ethylene glycol (C2H6O2, molar mass 62 g mol−1) and 200 g of water. The molality of the solution is
- 1.79 m
- 3.59 m
- 17.95 m
- 35.90 m
General
✓✗The ethanol−water azeotrope obtained by fractional distillation contains about
- 100% ethanol
- 68% ethanol by mass
- 95% ethanol by volume
- 50% ethanol by volume
General
✓✗The concentration of dissolved oxygen in water is about 6 ppm. This means
- 6 mol of O2 per litre
- 6 g of O2 in 100 g of water
- 6 g of O2 in 106 g of water (approximately)
- 6 mg of O2 per gram of water
General
✓✗The osmotic pressure of a 0.9% (mass/volume) NaCl solution is equal to that of blood. Such a solution is called
- hypertonic saline
- normal saline (isotonic with blood)
- a buffer solution
- hypotonic saline
General
✓✗Which one of the following is incorrect for an ideal solution?
- ΔHmix = 0
- ΔGmix = 0
- ΔP = Pobs − Pcalculated by Raoult's law = 0
- ΔUmix = 0
General
✓✗In a binary solution, the component present in the largest quantity is called the
- solubility
- solvent
- solvate
- solute
General
✓✗Pure water can be obtained from sea water by
- sedimentation
- reverse osmosis
- centrifugation
- plasmolysis
General
✓✗Which of the following has the maximum depression of freezing point (equal masses dissolved in equal masses of water)?
- Glucose (180 g mol−1)
- Urea (60 g mol−1)
- Sucrose (342 g mol−1)
- Fructose (180 g mol−1)
General
✓✗The number of types of binary solutions possible, based on the physical states of solute and solvent, is
- 6
- 4
- 3
- 9
General
✓✗The vapour pressure of a pure solvent is p10. When a non-volatile solute is added, the relative lowering of vapour pressure is
- p10/p1
- (p10 − p1)
- p1/p10
- (p10 − p1)/p10
General
✓✗The components of an azeotropic mixture cannot be separated by fractional distillation because
- the mixture is a solid
- the components do not boil
- the components react with each other
- the liquid and its vapour have the same composition
General
✓✗Statement I: The boiling point of a 0.1 m aqueous solution of K4[Fe(CN)6] is higher than that of a 0.1 m aqueous solution of Al2(SO4)3.
Statement II: Both electrolytes produce 5 ions per formula unit on complete dissociation.
Statement II: Both electrolytes produce 5 ions per formula unit on complete dissociation.
- Both Statement I and Statement II are correct
- Both Statement I and Statement II are incorrect
- Statement I is correct but Statement II is incorrect
- Statement I is incorrect but Statement II is correct