Question # 1

The value of SHE is cathode and anode is always taken to be

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One

Zero

Different

Same

Which of the following yield both hydrogen and chlorine on electrolysis:

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Electrolysis of acidified water.

Electrolysis of molten NaCl

Electrolysis of aqueous NaCl

Electrolysis of saline water

The oxidation state of an element is zero when

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It forms an oxide

It forms hydride

It is in free state

Only for noble gases

By using graphite electrode the electrolysis of aqueous solution of NaCI produces at anode

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H₂gas

Cl₂gas

NaOH

No metal

In a compound an atom has negative oxidation state because

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Atom is negatively charged

Atom acts as cathode

Atom is more electronegative

Atom has lowest ionization energy

An electrolyte

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Forms complex ions solution

Gives ions only when electricity is passed

Possesses ions even in solid state

Gives ions only when dissolved in water

The cell in which a non-spontaneous redox reaction takes place as a result electricity is known as :

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Electrolytic cell.

Voltaic cell.

Daniel cell.

Dry cell.

The function of salt bridge in the galvanic or voltaic cell is to

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Carry out oxidation at anode

To carry out reduction at cathode

Carry out electrolysis

To prevent the net charge accumulation in either of the half cells

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Iodine can oxidise iron

Bromine can oxidise iron

Iodine can oxidise bromine

Iron can oxidise bromine

In an electrolytic cell, the electrons flow from :

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Cathode to anode or opposite

Cathode to anode

Anode to cathode

Random flow

Reduction or oxidation potential of standard hydrogen electrode is :

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0.0 Volt

0.8Volt

1.0Volt

1.8Volt

Which of the following (1 M) conducts more electricity?

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Sulphuric acid

Boric acid

Nitric acid

Phosphorus acid

The conductivity of strong electrolyte

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Increases on dilution slightly

Does not change on dilution

Decreases on dilution

Depends on density of electrolyte it self

In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to

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Generate heat

Remove adsorbed oxygen from electrode surfaces

Produce High purity water

Create potential difference between two electrodes

Which of the following statement is incorrect about SHE(Standard hydrogen electrode):

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Reduction potential of Cu⁺² is smaller than H⁺ions whenit is coupled with copper electrode.

gas is passed in it at 1 atm pressure.

Its oxidation potential and reduction potential is zero.

It is made of platinum wire dipped in HCl solution

If the salt bridge is not used between two half cells, then the voltage

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Decrease rapidly

Decrease slowly

Does not change

Drops to zero

Matals usually conduct electricity because

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There are mobile electrons in the metallic structure

Metals are decomposed by current

Metals have high resistance

In metals the ions are free to move

The standard e.m.f. of a galvanic cell involving cell reaction with n = 2 is found to be 0.2965 V at 25°C. The equilibrium constant of the reaction would be

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1.0 x 10¹⁰

2.0 x 10¹¹

4.0 x 10¹²

1.0 x 10²

The reference calomel electrode is made from which of the following?

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ZnCl₂

CuSO₄

Hg₂Cl₂

HgCl₂

K,Ca and Li metals may be arranged in decreasing order of their reduction potential as :

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Li, k, Ca

Ca, K, Li

Li, Ca, K

K, Ca, Li

Electrochemistry is concerned with the conversion of electrical energy into chemical energy in :

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Galvanic cell

Electrolytic cell

Voltaic cell

Both (a) and (c)

Metals which are above SHE in electrochemical series

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Can liberate H₂from acid

Cannot liberate H₂from acid

Cannot always liberate H₂from acid

None of these

Standard reduction electrode potential of three metals A, B and C are erespectively + 0.05 V, -3.0 and -1.2V. The reducting power of

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B > C > A

A > B > C

C > B > A

A > C > B

An electric current is passed through silver nitrate solution using silver electrodes.10.79 g of silver was found to be deposited on the cathode if the same amount of electricity is passed through copper sulphate solution using copper electrodes, the weight of copper deposited on the cathode is

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6.4 g

2.3 g

128.8 g

3.2 g

In passage of electricity through aqueous solution of AgNO₃silver dissolves at anode to form Ag⁺, the electrodes are

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Silver metal

Pt metal

Graphite

Copper metal

When aluminium electrode is coupled with copper electrode in a galvanic cell :

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Reduction takes place at aluminium electrode.

Oxidation takes place at copper electrode.

Reduction takes place at copper electrode.

Both (a) and (c)

The number of coulombs required for the deposition of 107.870 g of silver is

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96500

48250

193000

10000

The standard EMF of Daniel cell is 1.10 volt. The maximum electrical work obtained from the Daniel cell is

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212.3 kJ

175.4 kJ

106.15 kJ

53.07 kJ

Ionization is the process in which ionic compounds when fused or dissolved in water split up into charged particles called :

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Atoms.

Electrons.

Protons .

Ions

When electricity is passed through molten electrolyte consisting of alumina and cryolite, 13.5 g of Al are deposited. The number of faradays of electricity passed must be

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2.0

1.5

1.0

0.5

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