Chemistry XII - ElectroChemistry 03

Question : 1

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On electrolysis of aq. NaCl in the presence of mercury cathode, the product obtained at anode and cathode respectively is

Options:

	Cl2, H2
	Cl2, Na
	O2, H2
	O2, Na

Solution :

(2)

In presence of Hg electrode discharge
potential of Na⁺ is lower than H⁺.

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Question : 2

(skipped)

In electrolytic cell

Options:

	Anode and cathode are negative and positive electrode respectively
	Anode and cathode are positive and negative electrode respectively
	At anode reduction reaction occurs
	At cathode oxidation reaction occurs

Solution :

(2)

Anode is positive and cathode is
negative electrode.

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Question : 3

(skipped)

In the electrolysis of CuSO₄ (aq.) using copper electrode, the correct statement is
 

Options:

	Concentration of solution increases
	Concentration of solution decreases
	Concentration of solution remains same
	Mass of cathode decreases

Solution :

(3)

No change in concentration of solution

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Question : 4

(skipped)

The correct statement is

Options:

	In electrolysis redox reaction occurs in direct manner
	Electrolysis is a spontaneous process
	In electrolysis chemical energy is converted into electrical energy
	All of these

Solution :

(1)

Anode and cathode are taken in the same vessel.

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Question : 5

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On the basis of standard oxidation potential value, O₂ should be first liberated at electrode. On the electrolysis of NaCl aqueous solution using inert electrode but actually Cl₂ is liberated at anode because

Options:

	Reaction I is fast
	Reaction II is slow
	Reaction I is kinetically favourable
	Reaction II is fast and kinetically favourable

Solution :

(4)

Liberation of O₂ is kinetically not favourable because it is a slow process so it requires higher voltage

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Question : 6

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In the electrolysis of aq. solution of KCl using inert electrode, pH of solution will

Options:

	Increase
	Decrease
	Remain same
	Zero

Solution :

(1)

Due to liberation of H₂.

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Question : 7

(skipped)

In the electrolysis of 50% H₂SO₄ using inert electrode, which of the following is obtained at anode?

Options:

	O2
	SO2
	H2S2O8
	SO3

Solution :

(3)

D.P. of HSO₄⁻ > D.P. of OH⁻ .

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Question : 8

(skipped)

 During electrolysis

Options:

	Cation moves towards anode
	Anion moves towards cathode
	Oxidation reaction occurs at anode
	Concentration of electrolyte solution always remains same

Solution :

(3)

Oxidation occurs at anode

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Question : 9

(skipped)

The product of electrolysis depends on

Options:

	Concentration of electrolyte solution
	Nature of electrolytes
	Nature of electrode
	All of these

Solution :

(4)

Product of electrolysis depends on all.

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Question : 10

(skipped)

Which of the following electrode can be used as inert electrode?

Options:

	Fe
	Graphite
	Zn
	Ni

Solution :

(2)

Graphite is used as inert electrode