The number of electrons that have a total charge of 9650 coulombs is_______.

(a)

6.22 ×10²³

(b)

6.022 ×10²⁴

(c)

6.022 ×10²²

(d)

6.022 ×10⁻³⁴

The button cell used is watches function as follows
Zn (s) + Ag₂O (s) + H₂O (l) ⇌ 2Ag (s) + Zn²⁺ (aq) + 2OH^-(aq) the half cell potentials are Ag₂O (s) + H₂O (l) + 2e^- → 2Ag (s) + 2OH^- (aq) E^o = 34V and Zn (s) → Zn²⁺ (aq) + 2e⁻ E⁰ = 0.76V . The cell potential will be_______.

(a)

0.84V

(b)

1.34V

(c)

1.10V

(d)

0.42V

Electrolyte	KCl	KNO3	HCl	NaOAC	NaCl
Λ- (Scm2 mol-1)	149.9	145.0	426.2	91.0	126.5

Calculate Λ^o_HoAC using appropriate molar conductances of the electrolytes listed above at infinite dilution in water at 25^oC_______.

(a)

517.2

(b)

552.7

(c)

390.7

(d)

217.5

How many faradays of electricity are required for the following reaction to occur MnO₄^-→ Mn²⁺

(a)

5F

(b)

3F

(c)

1F

(d)

7F

During electrolysis of molten sodium chloride, the time required to produce 0.1mole of chlorine gas using a current of 3A is _____.

(a)

55 minutes

(b)

107.2 minutes

(c)

220 minutes

(d)

330 minutes

Among the following cells
I) Leclanche cell
II) Nickel – Cadmium cell
III) Lead storage battery
IV) Mercury cell
Primary cells are ____.

(a)

I and IV

(b)

I and III

(c)

III and IV

(d)

II and III

The equivalent conductance of M/36 solution of a weak monobasic acid is 6 mho cm² equivalent^-1 and at infinite dilution is 400 mho cm² equivalent^-1. The dissociation constant of this acid is ______.

(a)

1.25 x 10⁻⁶

(b)

6.25 x 10^-6

(c)

1.25 x 10⁻⁴

(d)

6.25 x 10 ^-5

A certain current liberated 0.504gm of hydrogen in 2 hours. How many grams of copper can be liberated by the same current flowing for the same time in a copper sulphate solution ______.

(a)

31.75

(b)

15.8

(c)

7.5

(d)

63.5

Which one of the following solution has highest equivalent conductance?

(a)

0.1 M NaCI

(b)

0.05 M NaCI

(c)

0.005 M NaCI

(d)

0.25 M NaCI

Which among the following is the strongest reducing agent?

(a)

F₂

(b)

Cl₂

(c)

Zn

(d)

Li

A device in which spontaneous chemical reaction generates electric current ________.

(a)

Galvanic cell

(b)

Voltaic cell

(c)

Daniel cell

(d)

All the above

The limiting molar conductivities of HCI, CH₃COONa and NaCI are respectively 425, 190 and 150 mho cm² mol^-1 at 25°C. The molar conductivity of 0.1 M acetic acid is 9.2 mho cm² mol^-1. The degree of dissociation of 0.1 Macetic acid is ______.

(a)

0.10

(b)

0.02

(c)

0.19

(d)

0.03

Recharging of lead storage battery involves ______.

(a)

anode is reduced to pb

(b)

cathode is reduced to pb

(c)

cathode is oxidised to pb

(d)

anode is oxidised to pbO₂

What happens during the electrolysis of molten sodium chloride?

(a)

Cl₂ is released at the cathode

(b)

Liquid sodium is obtained at the anode

(c)

The emf of the overall reaction is -4.07 V

(d)

Cl₂ is released at the cathode and Liquid sodium is obtained at the anode

When one coulomb of electricity is passed through an electrolytic solution the mass deposited on the electrode is equal to ______.

(a)

equivalent weight

(b)

molecular weight

(c)

electrochemical equivalent

(d)

one gram

The specific conductance of a 0.01 M solution of KCI is 0.0014 ohm^-1 em^-1 at 25°C. Its equivalent conductance is ______.

(a)

14 ohm^-1 cm²eq^-1

(b)

140 ohm^-1 cm²eq^-1

(c)

1.4 ohm^-1 cm²eq^-1

(d)

0.14 ohm^-1 cm²eq^-1

The equivalent conductivity of CH₃COOH at 25°C is 80 ohm^-1 cm² eq^-1 and at infinite dilution 400 ohm^-1 cm^-1 eq^-1. The degree of dissociation of CH₃COOH is ______.

(a)

1

(b)

0.2

(c)

0.1

(d)

0.3

λ_c = μ_c for, ______.

(a)

NaCI

(b)

H₂SO₄

(c)

Na₂SO₄

(d)

Al₂(SO₄)₃

The inert electrode is ________.

(a)

Cu

(b)

Pt

(c)

Zn

(d)

None of these

The gas that bubbles over the platinum electrode in SHE is ________.

(a)

hydrogen

(b)

helium

(c)

neon

(d)

oxygen