MCQs of Electrochemistry

Electrochemistry MCQs

MCQs of Electrochemistry

Showing 11 to 20 out of 158 Questions

11.

Which is the device used for measurement of electrical resistance ?

(a)	Voltmeter
(b)	Wheatstone bridge
(c)	Galvanometer
(d)	Ammeter

12.

At which temperatures ceramic materials are known as superconductor ?

(a)	0 K
(b)	200 K
(c)	150 K
(d)	15 K

13.

l = l e n g t h, R = r e s i s \tan c e, A = a r e a o f c r o s s s e c t i o n, t h e n .

(a)	$R α \frac{l}{A}$
(b)	$R α \frac{A}{l}$
(c)	$R α \frac{1}{A l}$
(d)	$R α l A$

14.

What will be obtained at cathode and anode obtained respectively when electrolysis of aqueous solution of concentrated NaCl, out between graphite electrodes ?

(a)	${Cl}_{2} and Na metal$
(b)	$H_{2} and O_{2}$
(c)	${Cl}_{2} and H_{2}$
(d)	$H_{2} and {Cl}_{2}$

15.

If one mole electrons are passed through solutions of {MgSO}_{4}, {AgNO}_{3} and {AlCl}_{3}, in what mole ration the metals Mg, Ag and Al will be deposited at the electrodes ?

(a)	$1 : 1 : 1$
(b)	$1 : 2 : 3$
(c)	$2 : 1 : 3$
(d)	$3 : 6 : 2$

16.

Which phenomenon does not occur in Deniell cell ?

(a)	Increase in weight of plate of Cu.
(b)	The conduction of electricity takes place by salt bridge.
(c)	Increase in weight of plate of Zn.
(d)	There is no change in colour of ${ZnSO}_{4}$ solution.

17.

Which of the following reactions is for Daniell cell ?

(a)	${Cu}^{2 +} (aq) + Fe (s) ⇌ {Fe}^{2 +} (aq) + Cu (s)$
(b)	${Zn}^{2 +} (aq) + Mg (s) ⇌ Zn (s) + {Mg}^{2 +} (aq)$
(c)	${Cu}^{2 +} (aq) + Zn (s) ⇌ {Zn}^{2 +} (aq) + Cu (s)$
(d)	All the given reactions.

18.

What will be the symbolic representation of the cell for the given following reaction : Fe (s) + {Cd}^{2 +} (aq) ⇌ {Fe}^{2 +} (aq) + Cd (s)

(a)	$^{Θ} Fe (s) \| {Fe}^{2 +} (1 M) \| \| Cd (s) \| {Cd}^{2 +} (1 M)^{\oplus}$
(b)	$^{Θ} Cd (s) \| {Cd}^{2 +} (1 M) \| \| {Fe}^{2 +} (1 M) \| Fe (s)^{\oplus}$
(c)	$^{Θ} Cd (s) \| {Cd}^{2 +} (1 M) \| \| Fe (s)^{} \| {Fe}^{2 +} (1 M)^{\oplus}$
(d)	$^{Θ} Fe (s) \| {Fe}^{2 +} (1 M) \| \| {Cd}^{2 +} (1 M) \| Cd (s)^{\oplus}$

19.

For the cell reaction takes place in electrochemical cell-

(a)	ΔG = 0
(b)	ΔG < 0
(c)	ΔG > 0
(d)	ΔG ≥ 1

20.

Which of the following cell is different ?

(a)	Daniel cell
(b)	Voltaic cell
(c)	Galvanic cell
(d)	Electrolytic cell

Showing 11 to 20 out of 158 Questions