Chemical Effects of Current Test

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Chemical Effects of Current Test - 1

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Question 1
1 / -0

In a galvanic cell, electrons flow through the external circuit

A
from a negative electrode to a positive electrode

B
in both the directions

C
from a positive electrode to a negative electrode

D
from a cathode to an anode

Solution

In a galvanic cell, electrons flow through the external circuit from a negative electrode to a positive electrode.
Question 2
1 / -0

Which among the following is a non-electrolyte?

A
PbBr₂

B
CuSO₄

C
H₃PO₄

D
CS₂

Solution

CS₂ is a non-electrolyte because it does not form ions in aqueous solution.
Question 3
1 / -0

Which of the following elements would get discharged more readily at the cathode during electrolysis?

A
Pb

B
Ca

C
Ni

D
Al

Solution

The cation of an element lower in the reactivity series (having a greater reduction potential) is discharged at the cathode in preference to cations above it (having a lower reduction potential) in the reactivity series. Lead (Pb) will get discharged in preference to Ca, Ni and Al.
Question 4
1 / -0

On what factors does the selective discharge of ions depend?
1. The relative positions of ions in the electrochemical series.
2. The relative concentration of ions.
3. The nature of electrodes.

A
Both (1) and (2)

B
Both (1) and (3)

C
Only (1)

D
All of the above

Solution

The selective discharge of ions depends on the relative positions of ions in the electrochemical series, the relative concentration of ions and the nature of electrodes.
Question 5
1 / -0

Which of the following ions is migrated to anode when electricity is passed through dilute NaCl solution?

A
Na⁺, H₃O⁺

B
H₃O⁺

C
Cl^–, OH^–

D
OH^–

Solution

Chloride and hydroxyl ions are migrated to anode when electricity is passed through dilute NaCl solution.
Question 6
1 / -0

Which of the following is not an inert electrode?

A
Pt

B
Au

C
C

D
Al

Solution

Inert electrode is an electrode that serves only as a source or sink for electrons without playing a chemical role in the electrode reaction. Precious metals, mercury and carbon are typically used as inert electrodes. Thus, aluminium is not an inert electrode.
Question 7
1 / -0

Why is the electrolyte named aqueous copper (II) sulphate acidified with dil. H₂SO₄?

A
To enhance the conductivity of the electrolyte

B
To enhance the hydrolysis of the electrolyte

C
To prevent the colour change of the solution

D
To prevent the discharge of ions

Solution

The electrolyte named aqueous copper (II) sulphate is acidified with dil. H₂SO₄ to enhance its conductivity.
Question 8
1 / -0

Which of the following is observed during the electrolysis of molten lead bromide?

A
Reddish brown fumes of bromine at cathode and Greyish lead at anode.

B
Reddish brown fumes of bromine at anode and greyish lead at cathode.

C
Blue – black fumes of bromine at anode and black lead at cathode.

D
Dark-red precipitates at cathode and black red at anode.

Solution

During the electrolysis of molten lead bromide, fumes of bromine are formed at anode and those of lead are formed at cathode.

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Chemical Effects of Current Test - 1

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Chemical Effects of Current Test - 1

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Question 1

from a negative electrode to a positive electrode

in both the directions

from a positive electrode to a negative electrode

from a cathode to an anode

Solution

Question 2

PbBr2

CuSO4

H3PO4

CS2

Solution

Question 3

Pb

Ca

Ni

Al

Solution

Question 4

Both (1) and (2)

Both (1) and (3)

Only (1)

All of the above

Solution

Question 5

Na+, H3O+

H3O+

Cl–, OH–

OH–

Solution

Question 6

Pt

Au

C

Al

Solution

Question 7

To enhance the conductivity of the electrolyte

To enhance the hydrolysis of the electrolyte

To prevent the colour change of the solution

To prevent the discharge of ions

Solution

Question 8

Reddish brown fumes of bromine at cathode and Greyish lead at anode.

Reddish brown fumes of bromine at anode and greyish lead at cathode.

Blue – black fumes of bromine at anode and black lead at cathode.

Dark-red precipitates at cathode and black red at anode.

Solution

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PbBr₂

CuSO₄

H₃PO₄

CS₂

Na⁺, H₃O⁺

H₃O⁺

Cl^–, OH^–

OH^–