Electrolysis

Q. The emf of the cell in which the following reaction occurs is found to be 0.5105 at 298 K Zn(s) +Ni+(0.1M) -changes to Zn+(1M) +Ni(s). Thw standard emf of the cell is (1)0.4810 V (2)0.5696 V (3)-0.5105 (4)0.5400 V

Q.

Soap is a salt of _____ and sodium hydroxide.

1. White cement

2. Tooth decay

3. Detergents

4. Fatty acids

Q. Electrolysis involves a chemical reaction.

1. True
2. False

Q. During the electrolysis of cupric chromate solution, the colours observed near the electrodes are:

1. Red
2. Blue
3. Yellow
4. Orange

Q. ntThe emf of the following cell is 0.265 V at 25 deg. C and 0.2595 V at 35 deg. C . Calculate heat of reaction taking place at 25 deg. C .n nt Pt(H2) | HCl(aq) || AgCl | Agn

Q. What happens to salad brinjal of brinjal if it is exposed to air ? explain the reason.

Q.

In the electrolysis of aqueous Copper sulphate between Copper electrodes, the sulphate and hydroxyl ions remain as spectator ions. why?

Q.

The process of separation of material by passing direct electric current through the solution is known as ____

1. Separation

2. Segregation

3. Electrolysis

4. Dissociation

Q.

Explain the following:

The volume of hydrogen and oxygen formed at the cathode and anode respectively differs during the electrolysis of acidified water using platinum electrodes.

Q. Pure water is a good conductor of electricity.

1. True
2. False

Q.

What particles are present in pure lead bromide. write the equations for the reaction that takes place at the electrodes during the electrolysis of lead bromide.

Q.

Give reasons for the following:

Slice of an apple turns brown when left open.

Q. Choose the correct statement(s) regarding the electrolysis of cupric chromate solution.

1. Blue colour is found near the cathode.
2. Yellow colour is found near the anode.
3. Copper ions are found at anode.
4. Chromate ions are found at cathode.

Q. Which colour appears near the cathode during the electrolysis of cupric chromate solution?

1. Black
2. Blue
3. Green
4. Yellow

Q. Who established basic laws of electrolysis?

1. Antoine Lavoisier
2. Michael Faraday
3. John Dalton
4. Alfred Noble

Q. Electrolysis is used in the extraction of metals from their ores.

1. True
2. False