1. ⇒ (MHT CET 2023 10th May Morning Shift )

Which of the following is NOT a difficulty in setting SHE?

A. To obtain pure hydrogen gas

B. To obtain dry hydrogen gas

C. To maintain exactly $1 atm$ pressure

D. To bring the reaction in reverse direction

Correct Option is (D)

In standard hydrogen electrode (SHE), a platinum plate coated with platinum black is used as electrode. The platinum black is capable of adsorbing large quantities of $H_{2}$ gas. This allows the change from gaseous to ionic form and the reverse process to occur.

2. ⇒ (MHT CET 2023 9th May Morning Shift )

Identify the gas produced due to reduction of ${NH}_{4}^{+}$ ions at cathode during working of dry cell.

A. Ammonia

B. Hydrogen

C. Hydrogen chloride

D. Chlorine

Correct Option is (B)

In a dry cell, at cathode, ${NH}_{4}^{+}$ ions are reduced and hydrogen gas is produced.

$2 {NH}_{4 (aq)}^{+} + 2 e^{-} ⟶ 2 {NH}_{3 (aq)} + H_{2 (g)}$

3. ⇒ (MHT CET 2021 21th September Evening Shift )

Which among the following statements is true for Galvanic cell?

A. The anode is negative and cathode is positive.

B. Electrical energy is converted into chemical energy.

C. The anode is positive and cathode is negative.

D. Oxidation takes place at positive electrode and reduction takes place at negative electrode.

Correct Option is (A)

In a Galvanic cell :

1. Oxidation occurs at the anode, which is the negative electrode.
2. Reduction occurs at the cathode, which is the positive electrode.
3. The cell operates by converting chemical energy into electrical energy.

Correct answer :

Option A : The anode is negative and cathode is positive.

4. ⇒ (MHT CET 2021 20th September Evening Shift )

Which among the following aqueous salt solution is used in conductivity cell to determine cell constant?

A. AgNO $_{3}$

B. ZnSO $_{4}$

C. KCl

D. CuSO $_{4}$

Correct Option is (C)

The cell constant is determined using the 1 M, 0.1 M or 0.01 M KCl solutions.

⇒Electrochemistry