Chemical Effects of Electric Current Test

Result

Chemical Effects of Electric Current Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following cells use(s) electric current to produce a chemical reaction?

A
Dry cell

B
Solar cell

C
Electrolytic cell

D
Both dry cell and electrolytic cell

Solution

Dry cell uses chemical reaction to produce electric current.
Question 2
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Electrolysis of a solution of sodium chloride produces

A
Hydrogen gas at anode and chlorine at cathode

B
Hydrogen gas at cathode, chlorine at anode and sodium hydroxide

C
Hydrogen gas at anode and sodium hydroxide at cathode

D
Chlorine gas at anode and sodium hydroxide at cathode.
Question 3
1 / -0

Adding common salt to distilled water makes it

A
Good conductor

B
Insulator

C
Can't say

D
None of these

Solution

When impurities like salts are dissolved in water, they dissociate to form ions. Hence, it becomes a good conductor of electricity.
Question 4
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Why is the switch for any electrical appliance in ac circuit always connected to the live wire?

A
No current flows in the neutral wire.

B
There will be a short circuit if the switch is in the Earth lead.

C
The device can be switched off easily if the switch is in the neutral lead.

D
The device can be isolated (mode safe) if the switch is in the live lead.

Solution

The purpose of electric switch is to make and break the circuit as per our requirements. So it should be connected to the live wire. If the switch is in the neutral lead, the device can never be switched off.
Question 5
1 / -0

To protect iron from corrosion and rust, it is coated with

A
Tin

B
Copper

C
Mercury

D
Zinc.

Solution

The coating of zinc on iron prevents it from corrosion and rusting.

Question 6

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Directions For Questions

Four substances were tested for their electrical conductivity. The results are shown in the table. Study the table and answer the following questions.

Substance	Bulb	Substance at Cathode	Substance at Anode
P	Lights up	Aluminium	Oxygen
Q	Lights up	Nothing	Nothing
R	Does not light up	Nothing	Nothing
S	Lights up	Hydrogen	Carbon dioxide

...view full instructions

In substance Q, bulb lights up but no substance is found either at cathode or at anode, why?

Because Q is non-electrolyte.

Because Q is an element which remains unchanged when it conducts electricity.

Because Q is an electrolyte that conducts electricity when it is in the molten state.

Because Q is a poor conductor of electricity.

Solution

Q must be silver, copper, mercury and other metals.

Question 7

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Directions For Questions

Four substances were tested for their electrical conductivity. The results are shown in the table. Study the table and answer the following questions.

Substance	Bulb	Substance at Cathode	Substance at Anode
P	Lights up	Aluminium	Oxygen
Q	Lights up	Nothing	Nothing
R	Does not light up	Nothing	Nothing
S	Lights up	Hydrogen	Carbon dioxide

...view full instructions

Which solutions could be alumina and magnesium nitrate respectively?

P and Q

R and Q

P and S

P is the alumina but no one is magnesium nitrate.

Solution

When electricity is passed through molten alumina during electrolysis, the alumina splits up into its elements aluminium and oxygen. In the electrolysis of magnesium nitrate, oxygen is formed at anode and hydrogen is formed at cathode.

Question 8
1 / -0

The bumpers and door handles of motor cars, taps etc. are coated with silvery layer of chromium because

(i) It does not easily get corroded.

(ii) It forms a hard layer which does not easily get scratched.

(iii) It tarnishes quickly.

(iv) It is cheap.

Which of the following options is correctly identifies true (T) or false (F)?

A

(i) (ii) (iii) (iv)

F F T T

B

(i) (ii) (iii) (iv)

T T F F

C

(i) (ii) (iii) (iv)

F T F T

D

(i) (ii) (iii) (iv)

T T F T

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Re-Attempt Weekly Quiz Competition

(i)	(ii)	(iii)	(iv)
F	F	T	T

(i)	(ii)	(iii)	(iv)
T	T	F	F

(i)	(ii)	(iii)	(iv)
F	T	F	T

(i)	(ii)	(iii)	(iv)
T	T	F	T

Chemical Effects of Electric Current Test - 7

Result

Chemical Effects of Electric Current Test - 7

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Question 1

Dry cell

Solar cell

Electrolytic cell

Both dry cell and electrolytic cell

Solution

Question 2

Hydrogen gas at anode and chlorine at cathode

Hydrogen gas at cathode, chlorine at anode and sodium hydroxide

Hydrogen gas at anode and sodium hydroxide at cathode

Chlorine gas at anode and sodium hydroxide at cathode.

Question 3

Good conductor

Insulator

Can't say

None of these

Solution

Question 4

No current flows in the neutral wire.

There will be a short circuit if the switch is in the Earth lead.

The device can be switched off easily if the switch is in the neutral lead.

The device can be isolated (mode safe) if the switch is in the live lead.

Solution

Question 5

Tin

Copper

Mercury

Zinc.

Solution

Question 6

Because Q is non-electrolyte.

Because Q is an element which remains unchanged when it conducts electricity.

Because Q is an electrolyte that conducts electricity when it is in the molten state.

Because Q is a poor conductor of electricity.

Solution

Question 7

P and Q

R and Q

P and S

P is the alumina but no one is magnesium nitrate.

Solution

Question 8

(i) (ii) (iii) (iv) F F T T

(i) (ii) (iii) (iv) T T F F

(i) (ii) (iii) (iv) F T F T

(i) (ii) (iii) (iv) T T F T

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(i) (ii) (iii) (iv)

F F T T

(i) (ii) (iii) (iv)

T T F F

(i) (ii) (iii) (iv)

F T F T

(i) (ii) (iii) (iv)

T T F T