Solids in Liquids

Q.

Define the strength of a solution? Write its formula?

Q. The solubility of $BaS{O}_4$ in water is $2.42\times {10}^{-3}g{L}^{-1}$ at $298K$. The value of its solubility product $\left(K_{sp}\right)$ will be:
(Given molar mass of $BaS{O}_4=233gmo{l}^{-1}$)

1. $1.08\times {10}^{-14}mo{l}^2{L}^{-2}$
2. $1.08\times {10}^{-10}mo{l}^2{L}^{-2}$
3. $1.08\times {10}^{-8}mo{l}^2{L}^{-2}$
4. $1.08\times {10}^{-12}mo{l}^2{L}^{-2}$

Q.

Assetion (A) When methyl alcohol is added to water, boiling point of water increases.
Reason (R) When a volatile solute is added to a volatile solvent elevation in boiling point is observed.

Q.

In an exothermic process, solubility _______ with an increase in temperature.

Q. If dissolution is endothermic process, increasing the temperature, increases the solubility of the solute. (T/F)

1. True
2. False

Q.

Question 03
At equilibrium the rate of dissolution of a solid solute in a volatile liquid solvent is ................
(a) less than the rate of crystallisation
(b) greater than the rate of crystallisation
(c) equal to the rate of crystallisation
(d) zero

Q.

When a solid solute is added to solvent, some solute dissolves and its concentration increases in solution. This process is known as

1. Sublimation

2. Solubility

3. Crystallisation

4. Dissolution

Q.

Find out the solubility of $Mg(OH{)}_2$ in $0.1MNaOH$ solution.
[Given that the solubility product of $Mg(OH{)}_2$ is $1.8\times {10}^{-11}$]

1. $2\times {10}^{-8}M$
2. $1\times {10}^{-13}M$
3. $1.8\times {10}^{-9}M$
4. $2\times {10}^{-13}M$

Q.

Solubility of sodium chloride solution at room temperature is $36\mathrm{g}/100\mathrm{g}$of water. $200\mathrm{g}$ of saturated solution of Sodium chloride was allowed to evaporate when $75\mathrm{g}$ of water evaporated. Calculate the amount of crystals deposited due to evaporation.

Q.

When common salt is dissolved in water:

1. Melting point of solution increases

2. Boiling point of solution increases

3. Boiling point of solution decreases

4. both melting .point and boiling point decreases

Q. What mass of non-volatile solute (urea) needs to be dissolved in $100g$ of water in order to decrease the vapour pressure by $25\%$. What will be the molality of solution?

Q. the average rate and instantaneous rate of reaction are equal in zero order reaction. why?

Q. At $0^{\circ }C$ and $2.00atm$ partial pressure of oxygen, the aqueous solubility of $O_2\left(g\right)$ is $60.2mL$ $O_2$ per litre. Thus, molarity of $O_2$ in a saturated water solution when the $O_2$ is under the normal partial pressure of $0.3024atm$ is

1. $4.57\times {10}^{-4}M$
2. $2.18\times {10}^{-3}M$
3. $4.57\times {10}^{-2}M$
4. $8.12\times {10}^{-4}M$

Q.

The correct order of boiling points of HF , HCl , HBr and HI is

1. HI>HBr>HF>HCl

2. HCl>HBr>HI>HF

3. HF>HBr>HCl>HI

4. HF>HI>HBr>HCl

Q. Ionic compounds with higher lattice energy than solvation energy are readily soluble (T/F)

1. True
2. False

Q. Solubility product (Ksp) of cupric iodate $\left[Cu\right(I{O}_3{)}_2]$ is $7.4\times {10}^{–8}$. In which of the following mixtures, a ppt of cupric iodate will be formed?

1. Equal volume of $0.02MNaI{O}_3$ and $0.002MCu(Cl{O}_3{)}_2$
2. Equal volume of $0.001MNaI{O}_3$ and $0.002MCu(Cl{O}_3{)}_2$
3. Equal volume of $0.002MNaI{O}_3$ and $0.002MCu(Cl{O}_3{)}_2$
4. Equal volume of $0.004MNaI{O}_3$ and $0.002MCu(Cl{O}_3{)}_2$

Q. Calculate the vapour pressure of water at ${27}^{\circ }C$, when the aqueous tension at ${77}^{\circ }C$ is $314.1torr$. (Given: Heat of vapourisation of water is nearly $40kJ/mol$) [$e^{-2.3}=0.1$]

1. $31.4torr$
2. $62.8torr$
3. $94.2torr$
4. $15.7torr$

Q. The solubility for the salts of the type $A{B}_3$ is given by

1. $(K_{sp}27{)}^{\frac{1}{4}}$
2. ${\left(\frac{K_{sp}}{27}\right)}^{\frac{1}{5}}$
3. ${\left(\frac{K_{sp}}{27}\right)}^{\frac{3}{4}}$
4. ${\left(\frac{K_{sp}}{27}\right)}^{\frac{1}{4}}$

Q. The lowering of vapour pressure in a saturated aqueous solution of salt AB is found to be 0.108 torr. If vapour pressure of pure solvent at same temperature is 300 torr, find solubility product of salt AB

Q.

What is elevation of boiling point . how the molecular weight and non volatile substance is determined by the elevation of boiling ponit

Q.

Define the solubility of a solute.

Q.

In a mixture of A and B having vapour pressure of pure A and pure B are 400 mm Hg and 600 mm Hg respectively, the mole fraction of B in the liquid phase is 0.5. Calculate total vapour pressure and mole fraction of A and B in the vapour phase.

Q. are there any gas in liquids solutions for which dissolution is an endothermic process?

Q. 6. The elevation in boiling point of 0.1 m aqueous solution of NaCl, CuSO4 and Na2SO4 are in the ratio

Q. 2.0 molar solution in obtained, when 0.5 mole solute in dissolved in

1. 250 ml solvent
2. 250ml solution
3. 250 g solvent
4. 1000 ml solvent

Q.

The product obtained when a solid substance dissolves in a liquid is called

1. Solvent

2. Solute

3. Solution

4. Saturated Solution

Q. A saturated solution xcl3 has a vapour pressure 17.20mm hg at 20 C while pure water vapour pressure is 17.25 mm hg solubility product of xcl3 at 20 C is

Q. When one litre of a saturated solution of $PbC{l}_2$ $\left({\text{molar mass=278 g mol}}^{-1}\right)$ is evaporated, the residue is found to weight $2.78\text{g}$. If $K_{sp}$ of $PbC{l}_2$ is $y\times {10}^{-6}$, then $y$ is:

Q. Sodium crystallises in body-centred cubic lattice structure has edge length of unit cell 400 pm. The density (in g cm) will be

Q.

1. All are correct
2. II, III and IV
3. I and II
4. II and IV