Question # 1

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)

A cell in which electric current is produced as a result spontaneous redox reaction is called :

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Dry cell

Electrolytic cell

Galvanic cell

Standard cell

The galvanic or voltaic cells which are rechargeable called as

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Primary cells

Secondary cells

Dry cells

Infinite cells

When aqueous NaCl is electrolyzed, which of the following ions get discharged at anode :

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H⁺

Na⁺

OH^-

Cl^-

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

Calculate the amount of charge flowing in 2 minute in a wire of resistance 10Ωwhen a potential difference of 20 V is applied

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120 C

240 C

20 C

4 C

Most metals are conductors of electricity because of the :

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Light weight.

Immobility of the electrons.

Lustrous surfaces

Relatively free movement of their electrons

The reaction is galvanic cell is

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Spontaneous

Non-spontaneous

Acid-base

None of these

Zn does not displace Mg from MgSO₄solution because

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Zn is more electropositive than Mg

Zn is below Mg in electropositive series

Zn is above Mg in electrochemical series

Zn is trivalent Mg is divalent

Which of the following is the use of electrolysis?

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Eletrorefining

Electroplating

Both A and B

None of the above

The two half cells of a galvanic cell are connected by

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Ammeter

Salt bridge

Hydrogen electrode

Copper electrode

When electrically is passed through molten Al₂O₃+ Na₃AlF₆and 13.5 gms of Al are deposited, the number of farady must be

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0.5

1.0

1.5

2.0

Which statement is incorrect for NICAD battery

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The electrolyte is alkali

Cd acts as anode

MnO₂acts as electrolyte

NiO₂acts as cathode

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.

Reduction or oxidation potential of standard hydrogen electrode is :

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0.0 Volt

0.8Volt

1.0Volt

1.8Volt

The voltaic or galvanic cells which cannot be recharged are called

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Primary cells

Secondary cells

Infinite cells

Fuel cells

Which of the following will be good conductor of electricity

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Pure distilled water

Molten NaCl

Dilute solution of glucose

Chloroform

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-1.10 V

+1.10 V

-0.42 V

+0.42 V

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

The oxidation number of chromium in K₂Cr₂O₇is

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14

12

6

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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Iodine can oxidise iron

Bromine can oxidise iron

Iodine can oxidise bromine

Iron can oxidise bromine

The process of electrical coating of one metal on another to protect, decorate or to have greater resistance to corrosion is called

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Electroplating

Electrolysis

Conduction

Induction

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

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

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

Which statement is correct for the fuel cells

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These cells operate at low temperature

No catalyst used for the formation of water

MnO₂is used as electrolyte

Electrolysis is used for :

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Manufacture of caustic soda

Refining of copper

Electroplating

All of above

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

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ZnCl₂

CuSO₄

Hg₂Cl₂

HgCl₂

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

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H₂gas

Cl₂gas

NaOH

No metal

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