Electrochemical Reactions

Q.

Electrolyte can conduct electricity because the molecules ___ .

1. contain unpaired electrons, which are mobile

2. contain loosely held electrons which get free under the influence of voltage

3. break up into ions when a voltage is applied

4. are broken up into ions when the electrolyte is fused or is dissolved in the solvent

Q. What is meant by an electrochemical cell?

Q. The energy conversion which takes place while discharging a mobile battery is from to .

1. electrical
2. chemical
3. mechanical
4. light

Q.

In which of the below solution/s will the bulb glow?

1. vinegar

2. lemon juice

3. Sugar solution

4. sodium chloride

Q. The chemical reactions in which electrical energy is consumed or produced are known as reactions.

1. electrochemical
2. photochemical
3. thermochemical

Q.

__________ and __________ are strong electrolytes.

1. Phosphoric acid, Ammonia

2. Ammonium acetate, ammonium hydroxide,

3. Sodium hydroxide, potassium hydroxide

4. Acetic acid, Carbonic acid

Q.

__________ and __________ are weak electrolytes.

1. Ammonium acetate, acetic acid

2. Nitric acid, sulphuric acid

3. Sodium hydroxide, potassium hydroxide

4. Sodium chloride, potassium chloride

Q.

Which of the solution will not conduct electricity?

1. Lemon Juice

2. Vinegar

3. Sulphuric acid

4. Vegetable oil

Q. Complete equipment of electrolysis is known as___________.

1. electrolytic circuit
2. electrolyte
3. electrolytic process
4. electrolytic cell

Q.

Which of the following compounds will not undergo decomposition on passing electricity through aqueous solution?

1. Sugar

2. Lemon juice

3. Copper sulphate

4. Sodium chloride

Q. The chemical reactions in which electrical energy is consumed or produced are known as ______ reactions.

1. thermochemical
2. photochemical
3. electrochemical
4. neutralisation

Q.

We have seen potato getting used in the experiment of glowing bulbs. What kind of acid is contained in potato that helps in glowing the bulb experiment?

1. $HCl$

2. Dilute $H_{2}C{O}_3$

3. Dilute $H_{3}P{O}_4$

4. Dilute $H_{2}S{O}_4$

Q.

Define the Electrolysis

Q. Out of Al, Na, Cu and Ag; the following metals can be obtained by the electrolytic reduction of aqueous solution of their salts _____________.

1. None of these
2. Al, Na,
3. Cu, Ag
4. Al, Ag

Q.

___ current is used for the electrolysis process.

1. Neither of them

2. Alternating Current (AC)

3. Direct Current (DC)

4. Either of them

Q.

Descibe a conspicous change observed when

(i) a solution of Nacl is added to a solution of hydrated ferric oxide.

(ii) a beam of light is passed through a solution of Nacl and then through a solution.

Q.

When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes of cathode and anode are:

1. Impure zinc, Impure sample

2. Pure copper, Impure sample

3. Pure zinc, Pure copper

4. Impure sample, Pure copper

Q.

What is an electrolyte?