Question # 1

Electrochemical series is a list of element S arranged into the increasing order of their

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Standard oxidation potential

Standard reduction potential

Cell voltage

Ionization potential

When electric current is used to carry out non-spontaneous redox, the process is called

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Hydrolysis

Electrolysis

Decomposition

Neutralization

The cell which generates electricity as a result of spontaneous oxidation-reduction reaction is called

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Electrolytic cell

Nelson's cell

Galvanic cell

Down's cell

Which of the following is the use of electrolysis?

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Eletrorefining

Electroplating

Both A and B

None of the above

Reaction takes place at anode is

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Ionization

Reduction

Oxidation

Hydrolysis

A smuggler could not carry gold by chemically depositing iron on the gold surface since

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Gold is denser

Iron rusts

Gold has higher reduction potential then iron

Gold has lower reduction potential then iron

A cell in which spontaneous redox reaction generates an electric current is called

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Electrolytic cell

Electrochemical cell

Voltaic or Galvanic cell

Biological cell

When aqueous solution of NaOH is electrolysed useing graphite electrodes, the product obtained at anode is

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O₂gas

H₂gas

Na metal

Na₂O

A half reaction can be defines as :

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It always occurs at cathode.

Involves only half of a mole of electrolyte.

Occurs at one of the electrode.

Goes only half way to completion.

F₂, Cl₂, Br₂and l₂lie below SHE is the Electro chemical series that is why these

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Undergo reduction

Undergo oxidation

Liberate H₂gas with steam

None of these

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)

The amount of electricity that can deposit 108 g of silver from silver nitrate solution is

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1 ampere

1 coulomb

1 faraday

2 ampere

The oxidation number of Mn is KMnO₄is

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+2

+4

+6

+7

The best electrode used in salt bridge is KCl. Which other electrolyte an also be used for the purpose :

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NaCl

NH₄NO₃

KNO₃

NaNO₃

Purification of an impure copper is made by electrolytic cell, in which impure copper is anode and pure copper is cathode, and the electrolyte used is

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H₂SO₄

CuSO₄

ZnSO₄

Na₂SO₄

While balancing an equation by ion electron method, the number of oxygen atoms are balanced by

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OH^-

H₂O

O₂

H⁺

In electrolysis of NaCl when Pt electrode is taken then H₂is liberated at cathode while with Hg cathode it forms sodium amalgam

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Hg is more inert than Pt

More voltage is required to deduce H⁺at Hg than Pt

Na is dissolved in Hg while it does not dissolve in Pt

Conc. of H⁺ions is larger when Pt electrode is taken

Which of the following correctly describes the process occurring at the electrodes when molten NaCl is electrolyzed:

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No reaction at anode, reduction at cathode.

No reaction at cathode, oxidation at anode.

Oxidation at anodes, reduction at cathode.

Oxidation at cathode, reduction at anode.

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

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96500

48250

193000

10000

The specific conductance of 0.1 M NaCl solution is 1.06 x 10^-2ohm^-1mol^-1. Its molar conductance in ohm^-1cm²mol^-1is

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1.06 x 10²

1.06 x 10³

1.06 x 10⁴

53

When quantity of electricity passed is one faraday then the mass deposited at the electrode is equal to

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One gm, atomic weight

One gm, Equivalent

Eletrochemical equivalent

None of the above

A standard hydrogen electrode (S.H.E) consists of a platinized platinum electrode dipped in 1 molar solution of H⁺ions and hydrogen gas is passed at a pressure of

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One pascal

One kilo pascal

One atmoshpere

Then atmoshpere

Out of Cu, Ag, Fe and Zn the metal which can displace all others from theri salt solution is

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Ag

Cu

Zn

Fe

Caustic soda is obtained by electrolysis of conc. aqueous solution of NaCI in a cell called

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Daniell's cell

Nelson's cell

Down's cell

Voltaic cell

Pick out the wrong statement. In electrochemical cell

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Electrons are released at anode

Cathode is regarded as negative electrode

Chemical energy is converted into electrical energy

Salt bridge maintains the electrical neutrality of the solution

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.

In KO₂the oxidation state of oxygen is

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-2

-1

+1/2

-1/2

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

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One

Zero

Different

Same

Which one of the following reactions is not spontaneous

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Corrosion reaction are

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Spontaneous redox reaction

Non-spontaneous acid-base reactions

Spontaneous acid-base reactions

None of these

When fused PbBr₂is electrolyed then

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Bromine appears at cathode

Lead deposited at the cathode

Lead appears at the anode

None of these happens

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