Chemistry Question Bank

The relative lowering of vapour pressure is equal to the ratio between the number of (BVP 2010)

The mass of non-volatile solute of molar mass 40 g/mol that should be dissolved in 114 g of octane to lower its vapour pressure by 20% is (KCET 2012)

If the elevation in boiling point of a solution of 10 g of solute (molecular weight = 100) in 100 g of water is b T , the ebulliscopic constant of water is (Manipal 2010)

The boiling point of water is 1000C. What will be the boiling point of an aqueous solution containing 0.6 g of urea (molar mass = 60) in 100 of water? b k for water 0.52 K / m (RPMT 2010) (a) o 100.052 C (b) o 101.052…

Of the following 0.10 m aqueous solutions, which one will exhibit the largest freezing point depression? (AIPMT 2014)

0.1 M NaCl and 0.05 M BaC₁₂ solutions are separated by a semipermeable membrane in a container. For this system, choose the correct answer. (AMU 2010)

25.3 g of sodium carbonate, Na₂CO₃ is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion and carbonate ions respectively are (Molar mass…

An aqueous solution is 1.0 molal in KI. Which change will cause the vapour pressure of the solution to increase? (AIPMT 2010)

A solution of sucrose (molar mass = 342g mol -l) has been prepared by dissolving 68.5g of sucrose in 1000g of water. The freezing point of the solution obtained will be (Kf for water = 1.86 K Kg mol-l) (AFMC 2010) (a)…

To observe an elevation in boiling point of 0.050C, the amount of a solute (molecular weight = 100) to be added to 100 g of water (Kb =0.5) is (WB JEE 2014)

The vapour pressure of benzene at a certain temperature is 640 mm of Hg. A non-volatile electrolyte solute weighing 2.175 g is added to 30.08 g of benzene. If the vapour pressure of the solution is 600 mm of Hg, what …

Vapour pressure of dilute aqueous solution of glucose is 750 mm of Hg at 373 K. The mole fraction of solute is (vapour pressure of pure water is 760 mm of Hg) SOLUTIONS

The milli moles of N₂ gas that will dissolve in 1L of water at 298 K. when it is bubbled through water and has a partial pressure of 0.96 bar will be (Given that at 298 K KH = 76.8 k bar)

According to Henry’s law ‘the partial pressure of the gas in vapour phase (p) is proportional to the mole fraction of the gas (x) in the solution’. For different gases the correct statement about Henry’s constant is

KH value for Ar(g), CO₂(g), HCHO (g) CH₄(g)are 40.39, 1.67, 1.83 × 10–5 and 0.413 respectively. Arrange these gases in the order of their increasing solubility.

To increase the solubility of CO in soft drinks and soda water

Henry’s law constant of oxygen is 1.4 × 10–3 mol L–1. atm–1 at 298 K. How much of oxygen is dissolved in 100 mL at 298 K when the partial pressure of oxygen is 0.5 atm? (Kerala CEE)

The vapour pressure of water at room temperature is 23.8 mm Hg. The vapour pressure of an aqueous solution of sucrose with mole fraction 0.1 is equal to

For an ideal solution, the correct option is: (2019) (a) mixV at constant T and P (b) mixH at constant T and P (c) mixG at constant T and P (d) mixS at constant T and P Ans. (b) Sol. For ideal solution, mix mix mix mi…

Vapour pressure of pure ‘A’ is 70 mm of Hg at 25ºC. It forms and ideal solution with ‘B’ in which mole fraction of A is 0.8. If the vapour pressure of the solution is 84 mm of Hg at 25ºC, the vapour pressure of pure ‘…

100 ml of a liquid A was mixed with 25 ml of a liquid B to give a non-ideal solution of A-B mixture. The volume of this mixture would be

The unit of ebullioscopic constant is (UK PMT 2014) (a) Kkgmol (b) molkgK (c) Kgmol K (d) KmolKg

Vapour pressure of a solution of non-volatile solute is

The percentage (by weight) of sodium hydroxide in a 1.25 molal NaOH solution is

The molarity of a solution obtained by mixing 800 mL of 0.5 M HCl with 200 mL of 1M HCl will be