Question # 1

Fe can displace Cu form CuSO4solution because

Choose an answer

Fe is ferromagnetic

Fe is below Cu in electrochemical series

Fe is above Cu in electrochemical series

Fe exists in divalent oxidation state

In the electrolysis of fused bauxite (Al₂O₃2H₂O) with fused Cryolite (Na₃AlF₆) using carbon rods as anode. The product obtained at cathode is

Choose an answer

Na metal

F₂gas

Al metal

O₂gas

Choose an answer

-1.10 V

+1.10 V

-0.42 V

+0.42 V

The cathodic reaction in the electrolysis of dill H₂SO₄with Pt electrodes

Choose an answer

Reduction

Oxidation

Both oxidation and reduction

neither oxidation or reduction

Choose an answer

Adding H₂O and H⁺ions

Adding OH^-ions

Adding O²molecules

Adding O atoms

The art of electroplating was given by

Choose an answer

Faraday

Edison

Thomas Gradam

Brugan

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 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 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

During redox reaction an oxidizing agent

Choose an answer

Gains electrons

Is oxidized

Loses electrons

Hydrolysed

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

In lead accumulator the electrolyte is H₂SO₄solution is

Choose an answer

30% H₂SO₄

60% H₂SO₄

80% H₂SO₄

90% H₂SO₄

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

Which of the following is the use of electrolysis?

Choose an answer

Eletrorefining

Electroplating

Both A and B

None of the above

Choose an answer

A strong reducing agent

A strong oxidising agent

Better oxidising agent than hydrogen

Less reducing agent than hydrogen

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

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

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

Oxidation number of oxygen in OF₂is

Choose an answer

+1

-1

+2

-2

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

A dry alkaline cell has porous Zn anode and MnO₂as cathode the electrolyte used is

Choose an answer

Ca(OH)₂

NaOH

KOH

NH₄OH

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

Alkaline battery has a voltage of

Choose an answer

4.5 V

3.5 V

2.5 V

1.5 V

The conversion of chemical energy into electrical energy requires :

Choose an answer

Electrolytic cell

Galvanic cell

Voltaic cell

Both (b) and (c)

When fused PbBr₂is electrolyed then

Choose an answer

Bromine appears at cathode

Lead deposited at the cathode

Lead appears at the anode

None of these happens

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.

Time required to deposit one millimole of aluminium metal by the passage of 9.65 amperes through molten electrolyte containing aluminium ion is

Choose an answer

30 s

10 s

30,000 s

10,000 s

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

Choose an answer

Undergo reduction

Undergo oxidation

Liberate H₂gas with steam

None of these

Choose an answer

Cu

H

N

O

Choose an answer

Zn

H

S

O

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)

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