Question # 1

Metals like Fe, Mg, Al, Cr, Zn have more negative reduction potentials that is whey

Choose an answer

These don't react with steam

These react very slowly with steam to liberate H₂gas

These react rapidly with steam to produce the metallic oxides and liberate H₂gas

These react with cold water violently

Specific conductivity of a solution

Choose an answer

Increases with dilution

Decreases with dilution

Remains unchanged with dilution

Depends on mass of electrolyte

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

Sodium metal is obtained by the electrolysis of fused NaCl in cell is called

Choose an answer

Nelson's cell

Down's cell

Daniell cell

Voltaic cell

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

Which of the following will be good conductor of electricity

Choose an answer

Pure distilled water

Molten NaCl

Dilute solution of glucose

Chloroform

Standard reduction of Zn = -0.76 V and that of Ni is -0.25 V. On coupling them by a salt bridge which of these will act as anode

Choose an answer

Salt bridge will act as anode

Zn will act as anode

Ni will act as anode

None of these

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

The reduction potential to copper electrode is +0.34 V and that of Zn electrode is -0.76 V. when these two are coupled the e.m.f. of the cell is

Choose an answer

-0.42 V

+0.42

-1.10 V

+1.10 V

Li has the lowest reduction potential while the element with highest reduction potential is

Choose an answer

H

F

O

N

Best way to prevent rusting of iron is by

Choose an answer

Making iron cathode

Putting it in saline water

Both of these

None of these

Choose an answer

A strong reducing agent

A strong oxidising agent

Better oxidising agent than hydrogen

Less reducing agent than hydrogen

When fused PbBr2 is electrolyzed :

Choose an answer

Lead appears at anode.

Lead appears at cathode.

Bromine appears at cathode.

Lead appears at both electrodes.

An electric current is passed through silver voltameter connected to a water voltmeter. The cathode of the silver voltameter is 0.108 g more at the end of the electrolysis. The volume of oxygen evolved at STP is

Choose an answer

56 cm³

550 cm³

5.6 cm³

11.2 cm³

During electrolysis of KNO₃, H₂is evolved

Choose an answer

Anode

Cathode

Both a and b

None

Pick out the wrong statement. In electrochemical cell

Choose an answer

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 function of salt bridge is :

Choose an answer

To increase movement onions.

To increase the emf of cell.

To decrease the temperate

To maintain electrical neutrality

A current of 9.65 ampere flowing for 10 minutes deposits 3.0 g of the metal which is monovalent. The atomic mass of the metal is

Choose an answer

10

50

30

96.5

Lead accumulator contains

Choose an answer

30% NaCI solution as electrolyte

30% HCI solution as electrolyte

30% H₂SO₄solution as electrolyte

30% NaOH solution as electrolyte

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

Choose an answer

One gm, atomic weight

One gm, Equivalent

Eletrochemical equivalent

None of the above

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

Choose an answer

Reduction takes place at aluminium electrode.

Oxidation takes place at copper electrode.

Reduction takes place at copper electrode.

Both (a) and (c)

Metals which are above SHE in electrochemical series

Choose an answer

Can liberate H₂from acid

Cannot liberate H₂from acid

Cannot always liberate H₂from acid

None of these

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

Choose an answer

0.5

1.0

1.5

2.0

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

Choose an answer

96500

48250

193000

10000

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

Choose an answer

1.0 x 10¹⁰

2.0 x 10¹¹

4.0 x 10¹²

1.0 x 10²

An electrolyte

Choose an answer

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 conversion of chemical energy into electrical energy requires :

Choose an answer

Electrolytic cell

Galvanic cell

Voltaic cell

Both (b) and (c)

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

Choose an answer

1 ampere

1 coulomb

1 faraday

2 ampere

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

Choose an answer

Electrolytic cell

Voltaic cell

Biological cell

Electrochemical cell

Zn does not displace Mg from MgSO₄solution because

Choose an answer

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 one of the following reactions is not spontaneous

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