Atomic weight of silver is 107 . 9 and Avogadro's number is 6 . 06 × 10 23 . Calculate the charge on a silver ion in silver nitrate solution. Given ECE of silver is 0 . 001118 .

Consider, 1 gram equivalent of silver ∵ Gram equivalent = mole n Where, n = valency For silver n = 1 ion ∴ 1 Mole of silver = 108 Gram of silver Now, By faraday's laws of electrolysis W = ZIt Where It = Total charge Q ∴ W = ZQ Q = W Z Given, W = 107 . 9 And Z = 0 . 001118 = 11 . 18 × 10 - 7 Then, Q = 107 . 9 11 . 8 × 10 - 7 = 9 . 65 × 10 4 ° C Total silver ions in 1 Mole = 6 . 06 × 10 23 So, charge on 1 Silver ion = Q total number of ions = 9 . 65 × 10 4 6 . 06 × 10 23 = 1 . 58 × 10 - 19

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12th West Bengal Board

IMPORTANT

Earn 100

At room temperature, the thermos-emf generated in a thermocouple is $40 μV / ° C$ . Assuming a linear relationship between the emf and temperature, compute the smallest temperature difference that can be detected with a thermocouple using a galvanometer of $50 μ Ω$ Resistance and capable of detecting current as low as $10 A$ .

Important Questions on Thermal Effect and Chemical Effect of Current

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 21

Atomic weight of silver is

107.9

and Avogadro's number is

6.06 \times 10^{23} .

Calculate the charge on a silver ion in silver nitrate solution. Given ECE of silver is

0.001118 .

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 22

The terminals of a Daniell cell is joined through a resistance of

1 Ω

. If the internal resistance of the cell is

4 Ω

and the circuit is closed for an hour, calculate the mass of zinc dissolved assuming emf of the cell remaining at

1.08 V

. ECE of

Zn = 0.00034 gm / c . c .

EASY

12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 23

The potential difference across the terminals of a battery of emf

12 V

and internal resistance

2 Ω

drops to

10 V

when it is connected to a silver voltmeter. Calculate the silver deposited at the cathode in half an hour. Given-Relative atomic mass of silver is

108

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 24

In a copper voltmeter, a varying electric current, as shown in graph of Fig.

6.17

, is passed. The mass of copper deposited at the end of

30

seconds is

m

gram. Using this graph, find the value of electro-chemical equivalent of copper in

{gc}^{- 1}

Question Image

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 25

A copper voltameter is in series with a heated coil of resistance

0.1 Ω

. A steady current flows in the circuit for

20

minutes, and a mass of

0.99 gm

of copper is deposited at the cathode. If the electric chemical equivalent of copper is

0.00033 gm / C,

calculate the heat generated in the coil.

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 26

The wastage of zinc in a battery, when current is drawn from it is partly due to local action and partly due to electrolysis. If the wastage of zinc through local action is

20

percent only, find the total amount of zinc that will be wasted when the current drawn from the battery deposits only

6 gm

of silver from a solution of silver nitrate in water. Chemical equivalents of zinc and silver are respectively

32.5

and

108

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 1

There are three bulbs rated at

40 W, 40 W

and

80 W

110 V

. How should all the three lamps to be connected to produce normal glow when they are operated at

220 V

mains?

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12th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 6 - Thermal Effect and Chemical Effect of Current>EXERCISE 6>Q 2

A wire of resistance

r

is connected in series with another of resistance

R

and a battery of emf

E

and negligible internal resistance. If, without-any other change being made

(n - 1)

wires of resistance

r

each are joined in parallel, show that the heat produced in the

n

wires will be greater or less than that produced originally in the first wire according as

r

is greater or less than

R \sqrt{n}

Important Questions on Thermal Effect and Chemical Effect of Current

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