Chemical Effects of Electric Current Test

Question 1
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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

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
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Adding common salt to distilled water makes it

A
Good conductor

B
Insulator

C
Can't say

D
None of these

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.

Question 5
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To protect iron from corrosion and rust, it is coated with

A
Tin

B
Copper

C
Mercury

D
Zinc.

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.

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.

Question 8
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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

Submit Test

(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 Effect...

Question 1

Dry cell

Solar cell

Electrolytic cell

Both dry cell and electrolytic cell

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

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.

Question 5

Tin

Copper

Mercury

Zinc.

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.

Question 7

P and Q

R and Q

P and S

P is the alumina but no one is magnesium nitrate.

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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Question Analysis

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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