Electrolytic Dissociation

Q.

An aqueous solution of $BaC{l}_2$ (1.28gm in 100gm of water)boils at ${100.0832}^{\circ }$ at 1 atm. Calculate the degree of dissociation. ( $K_b$ of water is 0.512 k/m)

1. 0.5

2. 0.75

3. 0.85

4. 0.6

Q.

x moles of an organic non-volatile monobasic acid were taken and dissolved in water. The change in boiling point $△T_b$. pH of the solution will be

1. $-lo{g}_{10}\left[x\right]$
   

2. $-lo{g}_{10}[\frac{△T_b}{K_b}-x]$
   

3. $-lo{g}_{10}\left[2x\right]$
   

4. None of the above

Q. Electrolysis of molten NaCl releases ________ at cathode and _______ at anode respectively.

1. hydrogen, chlorine
   
2. sodium, hydrogen
   
3. chlorine, sodium
   
4. sodium, chlorine
   

Q. If ${\Lambda }_c$ for $N{H}_{4}OH$ is 11.5 $oh{m}^{-1}c{m}^{2}mo{l}^{-1}$, its degree of dissociation would be
(given that ${\lambda }^{\circ }N{H}_4^{+}$ = 73.4 and ${\lambda }^{\circ }O{H}^{-}$ = 197.6 $oh{m}^{-1}c{m}^{2}mo{l}^{-1}$ )

1. 0.0424
2. 0.0212
3. 0.0848
4. 0.004

Q.

A gaseous compound of molecular mass 82.1 dissociates on heating to 400K as : $X_2{Y}_{4\left(g\right)}\to X_{2\left(g\right)}+2Y_{2\left(g\right)}$. The density of the equilibrium mixture at a pressure of 1 atm and temperature of 400K is $2.0g{L}^{-1}$. The compound dissociates to the extent of :

1. 95.1%

2. 47.6%

3. 12.5%

4. None of these

Q. 0.2(M) solution of monobasic acid is dissociated to $0.95\%$ calculate its dissociation constant.
C = 0.2 M

1. 
2. 
3. 
4. 

Q.

When $0.004MN{a}_{2}S{O}_4$ is isotonic with 0.01M solution of glucose at same temperature.the apparent degree of dissociation of sodium sulphate is

1. 75%

2. 50%

3. 25%

4. 85%

Q. Electrodes are immersed in water and electric current is passed through it. Which of the following statements is correct?

1. Oxygen bubbles will be formed at the electrode which is connected to the negative terminal of the battery

2. Hydrogen gas will be formed at the electrode which is connected to the positive terminal of the battery

3. No gas is formed at any electrode

4. Hydrogen gas will be formed at the electrode which is connected to the negative terminal of the battery

Q. During the electrolysis of acidified water, the reaction taking place at anode is

1. $2{\text{H}}_3{\text{O}}^{+}\text{(aq)}+4e^{-}\to {\text{H}}_2\text{(g)}+2{\text{O}}_2\text{(g)}$
2. ${\text{H}}_2{\text{SO}}_4\text{(l)}+{\text{H}}_2\text{O (l)}\to 2{\text{H}}_3{\text{O}}^{+}\text{(aq)}+{\text{SO}}_4^{2-}$
3. $2{\text{H}}_2\text{O (l)}\to {\text{O}}_2\text{(g)}+4{\text{H}}^{+}\text{(aq)}+4e^{-}$
4. $2{\text{H}}_3{\text{O}}^{+}\text{(aq)}+2e^{-}\to {\text{H}}_2\text{(g)}+2{\text{H}}_2\text{O (l)}$

Q. During electrolysis of fused lead bromide, __________ is deposited at the cathode.

1. lead
2. bromine
3. hydrogen
4. oxygen