Question # 1

96500 C of electricity liberates from CuSO₄solution

Choose an answer

63.5 g of Cu

31.75 g of Cu

96500 g of Cu

100 g of Cu

In a solution of CuSO₄how much time will be required to precipitate 2g copper by 0.5 ampere current?

Choose an answer

12157.48 sec

102 sec

510 sec

642 sec

Choose an answer

A strong reducing agent

A strong oxidising agent

Better oxidising agent than hydrogen

Less reducing agent than hydrogen

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

Choose an answer

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

The equivalent conductivity of 0.1 M week acid is 100 times less than at infinite dilution. The degree of dissociation is

Choose an answer

100

10

0.01

0.001

Corrosion reaction are

Choose an answer

Spontaneous redox reaction

Non-spontaneous acid-base reactions

Spontaneous acid-base reactions

None of these

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

Choose an answer

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.

Metallic conduction is also called as :

Choose an answer

Ionic conduction.

Protonic conduction.

Electronic conduction

Super conduction

Which of the following will be good conductor of electricity

Choose an answer

Pure distilled water

Molten NaCl

Dilute solution of glucose

Chloroform

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

Choose an answer

OH^-

H₂O

O₂

H⁺

Which one of the following reactions is not spontaneous

Choose an answer

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

Choose an answer

Daniell's cell

Nelson's cell

Down's cell

Voltaic cell

In electrolytic cells, the chemical changes may be :

Choose an answer

Either spontaneous or non-spontaneous

Always spontaneous

Always non-spontaneous

More spontaneous and less non-spontaneous.

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

Choose an answer

Generate heat

Remove adsorbed oxygen from electrode surfaces

Produce High purity water

Create potential difference between two electrodes

The art of electroplating was given by

Choose an answer

Faraday

Edison

Thomas Gradam

Brugan

When fused PbBr₂is electrolyzed

Choose an answer

Bromine appears at he cathode

Lead is deposited at the cathode

Lead appears at the anode

None of these happens

Which statement is incorrect about standard hydrogen electrode

Choose an answer

Its oxidation and reduction potential is zero

It consists of Pt wire dipped on 1 molar HCI solution

The electrolyte is 1 molar NaOH solution

H₂gas is passes in it at 1 atmospheric pressure

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

Choose an answer

Decrease rapidly

Decrease slowly

Does not change

Drops to zero

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

Choose an answer

212.3 kJ

175.4 kJ

106.15 kJ

53.07 kJ

In the presence of copper electrodes the electrolysis of aqueous CuSO₄produces at cathode

Choose an answer

H₂gas

O₂gas

SO₂gas

Cu metal

Electrolysis is used for :

Choose an answer

Manufacture of caustic soda

Refining of copper

Electroplating

All of above

Choose an answer

Fe is reduced

Fe is oxidized

Cl₂is oxidized

None of these

Which statement is correct for the fuel cells

Choose an answer

These cells operate at low temperature

No catalyst used for the formation of water

MnO₂is used as electrolyte

Electrolytes in the form of solution or in the fused state have the ability to conduct :

Choose an answer

Light.

Electricity.

Ions.

Electrons.

Sodium can be obtained by :

Choose an answer

Electrolysis of acidified water.

By heating NaCl and water at 100°

Electrolysis of molten sodium chloride.

Electrolysis of aqueous sodium chloride.

During redox reaction an oxidizing agent

Choose an answer

Gains electrons

Is oxidized

Loses electrons

Hydrolysed

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

Choose an answer

NaCl

NH₄NO₃

KNO₃

NaNO₃

During electrolysis of KNO₃, H₂is evolved

Choose an answer

Anode

Cathode

Both a and b

None

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

Choose an answer

Li, k, Ca

Ca, K, Li

Li, Ca, K

K, Ca, Li

The oxidation state of an element is zero when

Choose an answer

It forms an oxide

It forms hydride

It is in free state

Only for noble gases

Cell in which an electric current drives a non-spontaneous reaction is called

Choose an answer

Electrolytic cell

Voltaic cell

Biological cell

Electrochemical cell

More Classes

Other Links

ECAT Chemistry Chapter 10 Electrochemistry Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer