Electrochemistry Test

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Electrochemistry Test - 31

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Weekly Quiz Competition

Question 1
4 / -1

The cathode reaction in electrolysis of dilute H₂SO₄ with platinum electrodes is

A
oxidation

B
reduction

C
both

D
neutralisation
Question 2
4 / -1

Which of the following plots represents correctly variation of equivalent conductance (∧ ) with dilution for a strong electrolyte ?

A

B

C

D
Question 3
4 / -1

The cathode in a galvanic cell and electrolytic cell is

A
Negatively charged in both cases

B
Positively charged in both cases

C
Positively charged in galvanic cell but negatively charged in an electrolytic cell

D
Negatively charged in a galvanic cell but positively charged in an electrolytic cell.
Question 4
4 / -1

Consider the reaction Mⁿ⁺ (aq) + ne^- → M (s) .The standard reduction potential values of the elements M₁, M₂ and M₃ are – 0.34 V, – 3.05 V and – 1.66 V respectively, The order of their reducing power will be

A
M₁ > M₂ > M₃

B
M₃ > M₂ > M₁

C
M₁ > M₃ > M₂

D
M₂ > M₃ > M₁
Question 5
4 / -1

Which one of the following statements is not applicable to electrolytic conductors?

A
New products show up at the electrodes

B
Ions are responsible for carrying the current

C
Show a positive temperature coefficient for conductance

D
A single stream of electrons flows from cathode to anode
Question 6
4 / -1

When a solution of an electrolyte is heated, the conductance of the solution.

A
increases because number of molecules of the electrolyte increases

B
decreases because of the increased heat

C
decreases because the dissociation of the electrolyte is suppressed

D
increases because the electrolyte is dissociated more
Question 7
4 / -1

It half cell reaction A + e^‒ → A^‒ has a large negative reduction potential, it follows that

A
A is readily reduced

B
A is readily oxidized

C
A^‒ is readily reduced

D
A^‒ is readily oxidized
Question 8
4 / -1

The standard reduction potentials at 25^o C of Li⁺ /Li, Ba²⁺ /Ba, Na⁺ /Na and Mg²⁺ / Mg are ‒3.03, ‒2.73, ‒2.71, and ‒ 2.37 Volt respectively, which one of the following is the strongest oxidizing agent ?

A
Na⁺

B
Li⁺

C
Ba²⁺

D
Mg²⁺
Question 9
4 / -1

If the number of moles of electrons involved in a reaction is doubled by multiplying all of the species appearing in the overall reaction by 2 then the

A
potential is halved

B
potential is doubled

C
potential is unchanged

D
potential is squared
Question 10
4 / -1

A

B

C

D