Electrochemical Principles

Q. What is the difference between disproportionation reaction and intramolecular redox reaction?

Q. Order the process flow involved in Bayer's process

1. Grinding
2. Leaching
3. Precipitation
4. Calcination
5. Reduction

Q. The electrolytic decomposition of water gives H2 and O2 in the ratio of
(A)1 : 2 by volume
(B)2 : 1 by volume
(C) 8 : 1 by mass
(D)1 : 2 by mass

Q. Electrolytic decomposition takes place in the presence of heat.

1. True
2. False

Q. The metal that cannot be obtained by electrolysis of an aqueous solution of its salts is:

1. Ag
2. Ca
3. Cu
4. Cr

Q. The diagram given below is the apparatus used for the electrolysis of water. Identify A, B, and C.

1. A – Hydrogen, B- Oxygen,
   C – Platinum plates
2. A – Hydrogen, B- Oxygen,
   C – Copper plates
3. A – Oxygen, B- Hydrogen,
   C – Platinum plates
4. A – Oxygen, B- Hydrogen,
   C – Platinum plates

Q. Which of the following processes is used in extractive metallurgy of Magnesium?

1. Fused salt electrolysis

2. Self-reduction

3. Aqueous solution electrolysis

4. Thermite reduction

Q. The metal that cannot be obtained by electrolysis of an aqueous solution of its salts is:

1. Ag
2. Ca
3. Cu
4. Cr

Q. When a piece of X is added to a sodium hydroxide solution, a gas Y is produced. Which of the following can be X and Y?

(a) X: Gold Y: Hydrogen
(b) X: Charcoal Y: Carbon dioxide
(c) X: Aluminium Y: Carbon dioxide
(d) X: Zinc Y: Hydrogen

Q.

Give reason

Potassiium Ferrocyanide is stored in dark coloured bottles and kept away from sunlight