Chemistry

Q. The freezing point ${(}^{\circ }C)$ of a solution containing 0.1 g of $K_3\left[Fe\right(CN{)}_6]$ (molecular weight 329) in 100 g of water $(K_f=1.86Kkgmo{l}^{-1})$

1. $-2.3\times {10}^{-3}$
2. $5.7\times {10}^{-2}$
3. $5.7\times {10}^{-3}$
4. $-1.20\times {10}^{-2}$

Q. For a dilute solution, Raoult’s law states that

1. The lowering of vapour pressure is equal to the mole fraction of the solute.
2. The relative lowering of vapour pressure is equal to the mole fraction of the solute
3. The vapour pressure of the solution is equal to the mole fraction of the solvent.
4. The relative lowering of vapour pressure is proportional to the amount of solute in the solution

Q. Which of the following 0.1 M aqueous solutions will have the lowest freezing point?

1. Potassium sulphate
2. Glucose
3. Sodium Chloride
4. Urea

Q. During depression in the freezing point in a solution, the following are in equilibrium.

1. Liquid solvent, solid solvent
2. Liquid solvent, solid solute
3. Liquid solute, solid solute
4. Liquid solute, solid solvent

Q. A solution of $N{a}_2{S}_2{O}_3$ is standarised iodometrically against $0.167$ gram of $KBr{O}_3$. This process requires $50\text{mL}$ of the $N{a}_2{S}_2{O}_3$ solution. What would be the normality of the $N{a}_2{S}_2{O}_3$ solution?
(Molar mass of $KBr{O}_3$ is $167\text{g/mol}$)

1. $0.2\text{N}$
2. $0.12\text{N}$
3. $0.72\text{N}$
4. $0.02\text{N}$

Q. A molal solution is one that contains 1 mol of a solute in

1. 1000 g of solvent
2. 1 L of solvent
3. 1 L of solution
4. 22.4 L of solution

Q. The freezing point among the following equimolal aqueous solutions will be highest for

1. $C_6{H}_{5}N{H}_{3}Cl$ (aniline hydrochloride)
2. $C_6{H}_{12}{O}_6\left(glucose\right)$
3. $Ca(N{O}_3{)}_2$
4. $La(N{O}_3{)}_3$

Q. The freezing point among the following equimolal aqueous solutions will be highest for

1. $C_6{H}_{5}N{H}_{3}Cl$ (aniline hydrochloride)
2. $Ca(N{O}_3{)}_2$
3. $La(N{O}_3{)}_3$
4. $C_6{H}_{12}{O}_6\left(glucose\right)$

Q. When mercuric iodide is added to the aqueous solution of potassium iodide,

1. Freezing point is raised
2. Freezing point is lowered
3. Freezing point does not change
4. Boiling point does not change

Q. The co-ordination number of a metal in co-ordination compounds is the:

1. same as secondary valency
2. sum of primary and secondary valencies
3. same as primary valency
4. difference between secondary and primary valencies