Question # 1

The substance having highest conductivity at room temperature among the following is

Choose an answer

0.1 N HCl

0.1 N NaCl

Graphite

Glass

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

Choose an answer

ZnCl₂

CuSO₄

Hg₂Cl₂

HgCl₂

A half reaction can be defines as :

Choose an answer

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.

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

Choose an answer

1.06 x 10²

1.06 x 10³

1.06 x 10⁴

53

96500 C electricity is passed through CuSO₄. The amount of copper precipitated is

Choose an answer

0.25 mole

0.5 mole

1.0 mole

2.00 mole

Coinage metals like Au, Pt, Ag and Cu are the least reactive metals and don't liberate H₂gas when treated with acids because

Choose an answer

These have very high positive values of reduction potentials

These have very high negative values of reduction potentials

Their ionization potentials are lowest

Their reduction potentials are close to SHE

Matals usually conduct electricity because

Choose an answer

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

Pure water does not conduct electricity because it

Choose an answer

Has low boiling point

Is almost unionized

Is neutral

Is readily decomposed

In a compound an atom has negative oxidation state because

Choose an answer

Atom is negatively charged

Atom acts as cathode

Atom is more electronegative

Atom has lowest ionization energy

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

Which statement is incorrect for balancing of redox reactions by ion-electron method

Choose an answer

The reaction is splitted into two half reactions

H₂O and H⁺ions are added for acidic or neutral reaction to balance O and H atoms

To balance H, HCi, is added

To balance O and H in the alkaline reaction OH^-added

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

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

Choose an answer

Electrolysis of acidified water.

Electrolysis of molten NaCl

Electrolysis of aqueous NaCl

Electrolysis of saline water

During redox reaction an oxidizing agent

Choose an answer

Gains electrons

Is oxidized

Loses electrons

Hydrolysed

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

Choose an answer

H

F

O

N

Choose an answer

Adding H₂O and H⁺ions

Adding OH^-ions

Adding O²molecules

Adding O atoms

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

Choose an answer

Iodine can oxidise iron

Bromine can oxidise iron

Iodine can oxidise bromine

Iron can oxidise bromine

During electrolysis, electrons are :

Choose an answer

Lost by anions and gained by cations

Gained by anions and lost by cations

Gained only

Lost only

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

Choose an answer

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

Choose an answer

Electrolytic cell

Electrochemical cell

Voltaic or Galvanic cell

Biological cell

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.

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.

During electrolysis of KNO₃, H₂is evolved

Choose an answer

Anode

Cathode

Both a and b

None

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

The oxidation number of H is -1 in the compound

Choose an answer

H₂O

H₃BO₃

NaOH

NaH

Which of the following statements is true about Galvanic cell

Choose an answer

Anode is negatively charged

Reduction occurs at anode

Cathode is positively charge

Reduction occurs at cathode

Which of the following will be good conductor of electricity

Choose an answer

Pure distilled water

Molten NaCl

Dilute solution of glucose

Chloroform

Which of the substances Na, Hg, S Pt and graphite can be used as electrodes in electrolytic cells having aqueous solution?

Choose an answer

Na, Pt and graphite

Na and Hg

Pt and graphite only

Na and S only

Same amount of electric current is passed through solutions of AgNO₃and HCl. If 1.08 g of silver is obtained in the first case, the amount of hydrogen liberated as S.T.P in the second case is

Choose an answer

112 cm³

22400 cm³

224 cm³

1.008 g

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

Choose an answer

6.4 g

2.3 g

128.8 g

3.2 g

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