Question # 1

When aqueous solution of NaOH is electrolysed useing graphite electrodes, the product obtained at anode is

Choose an answer

O₂gas

H₂gas

Na metal

Na₂O

The electrolysis of CuSO₄aqueous solution using copper as cathode as well an anode the substance which deposits at cathode is

Choose an answer

H₂SO₄

Oxygen

Copper

Hydrogen

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.

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

Which of the following (1 M) conducts more electricity?

Choose an answer

Sulphuric acid

Boric acid

Nitric acid

Phosphorus acid

The oxidation number of free element is always taken to be

Choose an answer

0

1

2

-1

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

The oxidation number of Mn is KMnO₄is

Choose an answer

+2

+4

+6

+7

The difference of potential of two electrodes when concentration of solution is 1M each at 25°C and1 atm is called :

Choose an answer

Cell reaction.

Electrode potential.

Cell voltage.

Standard cell potential.

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 electrode through which the electrons enter the electrolytic solution is electrolytic solution is

Choose an answer

Anode

Cathode

May be anode or cathode

None of these

Lead accumulator stops discharging current when

Choose an answer

Lead at anode converted to PbO₂

PbO₂at cathode converted to Pb

Both electrodes are completely covered with PbSO₄

Both electrodes are completely covered with Pb(OH)₂

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

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