Electrochemical Cell

Q. State the factors that influence the preferential discharge of ions at the electrodes.

Q.

$KCl$ is preferred over $NaCl$ for salt bridge.

1. True

2. False

Q.

What is the nature of electrolyte used in a salt bridge?

Q. An iron nail is to be electroplated with nickel using a nickel plate to prevent it from rusting. The electrolyte used for this purpose is nickel sulphate. Based on the above information, answer the following questions.

Which of the following gets oxidised at the anode?

[1 mark]

1. $S{{O_4}^{2-}}^{}$
2. $O{H}^{-}$
3. $H^{+}$
4. Ni

Q. why lithium is the strongest reducing agent while caesium is most electropositive??

Q. Which of the following expressions about the electrolysis of a salt solution is correct ?
m = mass of substance deposited;Q=electricity in coulombs;M=molar mass

z = valence ; F = faraday

1. m = ItF/Mz

2. m = QM/Fz

3. m = Itz/MF

4. m = ItMF/z

Q. An electrolytic cell consists of:
(i) Positively charged cathode
(ii) Positively charged anode
(iii) Negatively charged anode
(iv) Negatively charged cathode

1. (i) and (iii)
2. (ii) and (iv)
3. (i) and (iii)
4. (i) and (iv)

Q. Two metal rods A, B are dipped is their ionic solutions respectively.
Following reactions happen at each electrode.
$A\to A^{2+}+2e^{-}{B}^{2+}+2e^{-}\to B$
Which of these two rods acquire negative charge?

1. A
2. B

Q. Which of the following conversion takes place in a galvanic cell?

1. Electrical energy to chemical energy
2. Chemical energy to electrical energy
3. Chemical energy to mechanical energy
4. Mechanical energy to chemical energy

Q.

In the experiment set up for the measurement of EMF of a half cell using a reference electrode and a salt bridge, when the salt bridge is removed, the voltage

1. Increase to maximum
2. Does not change
3. Decreases to half the value
4. Drops to zero

Q. A solution of caustic soda $\left(NaOH\right)$ in water or when fused, conducts an electric current. What is the similarity in these two cases?

Q. Two metal rods A, B are dipped is their ionic solutions respectively.
Following reactions happen at each electrode
$A\to A^{2+}+2e^{-}{B}^{2+}+2e^{-}\to B$
Which of these two rods acquire negative charge

1. A
2. B

Q. What is the work of salt bridge?

1. It transfers the electrons from negative rod to positive rod.
2. Maintains the electric neutrality in internal circuit.
3. Cools down the cell by injecting ions into electrolytes.
4. It accelerates the equilibrium.

Q. Which of the following conversion takes place in a galvanic cell?

1. Electrical energy to chemical energy
2. Chemical energy to electrical energy
3. Mechanical energy to chemical energy
4. Chemical energy to mechanical energy