Electrochemistry Test

Directions For Questions

The cell potential $$(E_{cell})$$ of a reaction is related as $$\triangle G = -nF\space E_{cell}$$, where $$\triangle G$$ represents max useful electrical work
$$n$$ = no. of moles of electrons exchanged during the reaction
for reversible cell reaction $$d(\triangle G) = \triangle_rV)dp - (\triangle_rS).dT$$
at constant pressure $$\quad d(\triangle G) = -(\triangle_rS).dT$$
$$\because\quad$$ At constant pressure $$\quad \triangle G = \triangle H - T.\triangle S\quad ...(1)$$
$$ \triangle G = \triangle H + T\left(\displaystyle\frac{d(\triangle g)}{dT}\right)_p \quad ...(2)$$
$$\left(\displaystyle\frac{dE_{cell}}{dT}\right)_p$$ is known as temperature coefficient of the e.m.f. of the cell

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Electrochemistr...

Question 1

Increase

Decreases

Either

Remains constant

Question 2

in well ventilated location.

in clean and dry place.

as near as practical to the battery being charged.

in location having all above features.

Question 3

$$\displaystyle\frac{nF}{\triangle S}$$

$$\displaystyle\frac{\triangle S}{nF}$$

$$\displaystyle\frac{\triangle S}{nFT}$$

$$-nFE$$

Question 4

50 $$\Omega$$

100 $$\Omega$$

25 $$\Omega$$

200 $$\Omega$$

Question 5

specific gravity of electrolyte

temperature of electrolyte

colour of electrolyte.

level of electrolyte.

Question 6

an increase in area of the plates inside the electrolyte

an increase in distance between the two electrodes

a decrease in size of the electrodes

an increase of age of the battery

Question 7

0.523

0.613

0.715

0.825

Question 8

$$-4.311 \times 10^{-4}$$

$$2.388 \times 10^{-4}$$

$$4.311 \times 10^{-4}$$

$$4.311 \times 10^{-5}$$

Question 9

28.95 JK$$^{-1}$$

14.47 JK$$^{-1}$$

57.9 JK$$^{-1}$$

21.70 JK$$^{-1}$$

Question 10

-148.05 kJ mol$$^{-1}$$

-138.15 kJ mol$$^{-1}$$

-168.25 kJ mol$$^{-1}$$

none of these

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