Chemical Effects of Electric Current Test

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Chemical Effects of Electric Current Test - 15

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Question 1
1 / -0

The chemical effect produced by an electric current depends on:

A
the nature of electrode

B
the tester

C
the conducting solution

D
none of the above

Solution

Because if the liquid is conducting i.e electrolyte only then free ions will be present . Only in that case electric current will be able to produce chemical effect otherwise not.
Question 2
1 / -0

Which of the following statement is correct while testing for conduction of electricity in lemon juice using an LED tester?

A
The liquid (lemon juice) allows the electric current to pass through. Hence, the circuit of tester is complete.

B
The current flows in the circuit of the tester.

C
The bulb glows which indicates lemon juice is a good conductor of electricity.

D
All of the above

Solution

When the liquid (lemon juice) between the two ends of the tester allows the electric current to pass, the circuit of the tester becomes complete. The current flows in the circuit and the bulb glows indicating that lemon juice is a good conductor of electricity.
Question 3
1 / -0

Which of the following would show deflection in the compass needle, the moment you dip the free ends of the tester?

A
Tap water, vinegar

B
Tap water, vegetable oil

C
Tap water, honey

D
Vegetable oil, honey

Solution

The materials which allow electricity o pass through them are called conductors.
When an electric current flows through a wire, it behaves like a magnet
Tap water and vinegar are good conductors of electricity. Hence, the compass needle show deflection.
Question 4
1 / -0

In the experiment to test for conduction of electricity through potato, which of the following observations indicate that a potato is a conductor of electricity?

A
Greenish blue spot on potato around one wire.

B
Greenish blue spot on potato around both wires.

C
Blue color spot on potato around one wire.

D
Blue color spot on potato around both wires.

Solution

Greenish blue colour spot on the potato around one wire was seen whereas there was no such spot around the other wire.
Question 5
1 / -0

If electrodes are immersed in water and a current was passed, bubbles of ___________ and __________ are produced.

A
oxygen and carbon dioxide

B
oxygen and hydrogen

C
hydrogen and carbon dioxide

D
nitrogen and carbon dioxide

Solution

If electrodes are immersed in water then bubbles of oxygen and carbon-di-oxide are produced on passing current.
Question 6
1 / -0

LED is better than bulb to use in a tester as :

A
it glows even when weak current passes through it.

B
it emits more light.

C
it is cheaper.

D
all of the above

Solution

A tester is an electrical device that is used to know current is flowing in the wire or not. A most efficient tester can detect weak current also.
To identify the current in the circuit it is important that it tester indicates even if law current flow, so LED is used in it instead of bulb.
Question 7
1 / -0

In the experiment to test for conduction of electricity through a potato, the greenish blue color spot on the potato is useful in identifying :

A
the positive terminal

B
the negative terminal

C
both A and B

D
neither A nor B
Question 8
1 / -0

Why do jewellery makers electroplate gold or silver on metals?

A
To protect it from corrosion.

B
To prevent spoilage of jewellery.

C
To make it shine.

D
To reduce cost.

Solution

Jewelry makers electroplate silver and gold on less expensive metals. These ornaments have the appearance of silver or gold but are less expensive.
Question 9
1 / -0

Which of the following gas is formed at the electrode, connected to the positive terminal of the battery?

A
Nitrogen gas

B
Hydrogen gas

C
Oxygen gas

D
Carbon dioxide gas

Solution

Oxygen bubbles are formed on the electrode connected to the positive terminal of the battery and hydrogen bubbles formed on the other electrode.
Question 10
1 / -0

Which of the following is true during electroplating?

A
The metal gets transferred from one electrode to another.

B
The metal gets deposited from positive terminal of a battery to negative terminal of the battery.

C
Some amount of metal gets dissolved in the solution of the electrolyte.

D
All of the above

Solution

During electrolysis,
1. The metal gets transferred from one electrode to another.
2. The metal gets deposited from positive terminal of a battery to negative terminal of the battery.
3. An equal amount of metal gets dissolved in the solution of the electrolyte.

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Re-Attempt Weekly Quiz Competition

Chemical Effects of Electric Current Test - 15

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Chemical Effects of Electric Current Test - 15

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Question 1

the nature of electrode

the tester

the conducting solution

none of the above

Solution

Question 2

The liquid (lemon juice) allows the electric current to pass through. Hence, the circuit of tester is complete.

The current flows in the circuit of the tester.

The bulb glows which indicates lemon juice is a good conductor of electricity.

All of the above

Solution

Question 3

Tap water, vinegar

Tap water, vegetable oil

Tap water, honey

Vegetable oil, honey

Solution

Question 4

Greenish blue spot on potato around one wire.

Greenish blue spot on potato around both wires.

Blue color spot on potato around one wire.

Blue color spot on potato around both wires.

Solution

Question 5

oxygen and carbon dioxide

oxygen and hydrogen

hydrogen and carbon dioxide

nitrogen and carbon dioxide

Solution

Question 6

it glows even when weak current passes through it.

it emits more light.

it is cheaper.

all of the above

Solution

Question 7

the positive terminal

the negative terminal

both A and B

neither A nor B

Question 8

To protect it from corrosion.

To prevent spoilage of jewellery.

To make it shine.

To reduce cost.

Solution

Question 9

Nitrogen gas

Hydrogen gas

Oxygen gas

Carbon dioxide gas

Solution

Question 10

The metal gets transferred from one electrode to another.

The metal gets deposited from positive terminal of a battery to negative terminal of the battery.

Some amount of metal gets dissolved in the solution of the electrolyte.

All of the above

Solution

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