Application of Electrolysis

Q.

The number of $C{l}^{-}$ and $C{a}^{+2}$ ions in 222g. of $CaC{l}_2$ are

1. 4N, 2N

2. 2N, 4N

3. 1N, 2N

4. 2N, 1N

Q.

The specific heat of a metal is 0.16 its approximate atomic weight would be

1. 32

2. 16

3. 40

4. 64

Q. How much oxygen will be obtained by the complete electrolysis of $90\text{kg}$ of water?
$2H_{2}O\to 2H_2+O_2$

1. $10\text{kg}$
2. $90\text{kg}$
3. $80\text{kg}$
4. $40\text{kg}$

Q. 1 mole of $N_2$ has _____ number of atoms.

1. 6.022 $\times$ ${10}^{23}$
2. 3.011 $\times$ ${10}^{23}$
3. 12.044 $\times$ ${10}^{23}$
4. 6.022 $\times$ ${10}^{22}$

Q. What is the relative atomic mass and atomic mass of calcium?

1. $40.0,40\text{u}$
2. $39.90,40.078\text{u}$
3. $40.078,40.078\text{u}$
4. $40.078,41.0\text{u}$

Q. $100\text{mL}$ of a $0.05\text{M}CuS{O}_4\text{aqueous}$ solution was electrolysed using inert electrodes by passing current till the pH of the resulting solution was 2. The solution after electrolysis was neutralised and then treated with excess $KI$ and the formed $I_2$ was titrated with $0.04\text{M}N{a}_2{S}_2{O}_3$. Calculate the volume of $N{a}_2{S}_2{O}_3$ required in $\text{mL}$.

1. $112.5\text{mL}$
2. $100\text{mL}$
3. $125\text{mL}$
4. None of these

Q. For the electrolysis of molten $NaCl$ using inert platinum electrodes, choose the correct option.

1. Reaction at cathode :
   $N{a}^{+}\left(l\right)+e^{-}\rightleftharpoons Na\left(s\right)$
2. Reaction at anode :
   $N{a}^{+}\left(l\right)+e^{-}\rightleftharpoons Na\left(s\right)$
3. All of the above.
4. Chlorine gas is produced at cathode

Q.
$E_{C{u}^{2+}|Cu}^0=+034V$

$E_{Z{n}^{2+}|Zn}^0=-0.76V$

Identify the incorrect statement from the below for the above cell :
(JEE MAIN 2019)

1. If $E_{ext}=1.1V$, no flow of $e^{-}$ or current occurs
2. If $E_{ext}>1.1V$ , Zn dissolves at Zn electrode and Cu deposits at Cu electrode
3. If $E_{ext}<1.1V$ , Zn dissolves at anode and Cu deposits at cathode
4. If $E_{ext}>1.1V$ , $e^{-}$ flow from Cu top Zn

Q.

Number of gram atoms of oxygen present in $0.3mole$ of $(COOH{)}_2.2H_{2}O$ is

1. 9

2. 18

3. 0.9

4. 1.8