${\mathrm{}}_{}^{}$The Emf of the following voltaic cell is:$$

\(\text {Ni }| \text {Ni}^{2+} (1 \text M) || \text {Au} ^{+3} \text {(1M) |Au}\)

\(\left ({~\mathrm{E}_{{\mathrm{Ni}^{+2}}/{\mathrm{Ni}}}^0=-0.25 \mathrm{~V}, \mathrm{E}_{{\mathrm{Au}^{+3}}/{\mathrm{Au}}}^0=1.50 \mathrm{~V}}\right )\)

1. 1.25 V
2. -1.75 V
3. 1.75 V
4. 4.0 V

The same amount of electric current is apassed through aqueous solution of MgSO₄ and AlCl₃. If 2.8 g Mg metal is deposited at amount of Al metal deposited in second cell will be

(1) 2.1 g

(2) 2.49 g

(3) 3.15 g

(4) 3.73g

What is the name of the device that converts the energy from the combustion of fuels such as hydrogen and methane directly into electrical energy?

(1) Fuel cell
(2) Electrolytic cell
(3) Dynamo
(4) Ni-Cd cell

$F_2$ gas can’t be obtained by the electrolysis of any $F^{-1}$salt because-

(A) Fluorine is the strongest reducing agent

(B) Fluorine is the strongest oxidising agent.

(C) Fluorine easily combine with atmospheric $O_2$

(D) All

If the E°_cell for a given reaction has a negative value then which of the following gives the correct relationships for the values of $∆$G° and K_eq?

(a) $∆$G° < 0;K_eq > 1

(b) $∆$G° < 0; K_eq < 1

(c) $∆$G°> 0; K_eq < 1

(d) $∆$G° > 0; K_eq > 1

Acetic acid has K_a = 1.8 × 10^–5 while formic acid had K_a = 2.1 × 10^–4. What would be the magnitude of the emf of the cell

Pt(H₂) $\left|\begin{array}{l}0.1\mathrm{M}<mspace\; width="1em"></mspace>\mathrm{acetic}<mspace\; width="1em"></mspace>\mathrm{acid}+\\ 0.1\mathrm{M}<mspace\; width="1em"></mspace>\mathrm{sodium}<mspace\; width="1em"></mspace>\mathrm{acetate}\end{array}\right|\left|\begin{array}{l}0.1\mathrm{M}<mspace\; width="1em"></mspace>\mathrm{formic}<mspace\; width="1em"></mspace>\mathrm{acid}+\\ 0.1\mathrm{M}<mspace\; width="1em"></mspace>\mathrm{sodium}<mspace\; width="1em"></mspace>\mathrm{formate}\end{array}\right|$ Pt(H₂) at 25°C

(1) 0.0315 volt

(2) 0.0629 volt

(3) 0.0455 volt

(4) 0.0545 volt

What will be the quantity of iron deposited by ferrous and ferric ion by 1F (Fe = 56)

(1) 14g, 9.3 g                                          

(2) 28g, 18.6 g

(3) 56g, 37.2g                                         

(4) None of these

The unit of specific conductance is:

What is the value of 

$p{K}_b<mspace\; width="1em"></mspace>(C{H}_{3}CO{O}^{-}<mspace\; width="1em"></mspace>)<mspace\; width="1em"></mspace>$
$if<mspace\; width="1em"></mspace>{\lambda }_m^0=<mspace\; width="1em"></mspace>390<mspace\; width="1em"></mspace>\&<mspace\; width="1em"></mspace>{\lambda }_m<mspace\; width="1em"></mspace>=<mspace\; width="1em"></mspace>7.8<mspace\; width="1em"></mspace>$
$for<mspace\; width="1em"></mspace>0.04<mspace\; width="1em"></mspace>of<mspace\; width="1em"></mspace>a<mspace\; width="1em"></mspace>C{H}_{3}COOH<mspace\; width="1em"></mspace>at<mspace\; width="1em"></mspace>25°C$

(A) 9.3                                               

(B) 9.2

(C) 4.7                                               

(D) 4.8

Given that a certain electric current generates 0.504 grams of hydrogen in 2 hours. How many gram of mass of copper can be liberated by the same current when applied for the same duration in a solution of CuSO₄?

1. 12.7

2. 16

3. 31.8

4. 63.5