Electrolysis of Water

Q. In electrolysis of water , hydrogen is collected at cathode and oxygen is collected at at the anode

1. True

2. False

Q.

How much electricity does the electrolysis of water uses?

Q.

Water is broken down into its constituent elements _________ and __________.

Q.

What is a negative electrode called?

Q. electrodes are used in the electrolysis of acidified water.

1. Pt
2. Ni
3. Fe

Q.

Which of the following is an electrolyte?

1. ${\mathrm{AgNO}}_3$solution

2. Alcohol

3. Mercury

4. Sugar solution

Q. Which gas is evolved at the anode during electrolysis of water?

1. Hydrogen
2. Sulphur dioxide
3. Nitrogen dioxide
4. Oxygen

Q. How does electricity pass through lime juice?

Q.

The apparatus in which electrolysis of an electrolyte takes place is known as ___.

Q.

Why do we use few drops of dilute HCl acid to the electrolyte before we plug in the electrodes to the direct current?

1. To collect hydrogen gas

2. For efficient electrolytic conduction

3. To add chloride ions

4. To activate solutes

Q. If molten MgCl2 is electolysed, suggest a suitable electrode ( anode)

Q. A dilute aqueous solution of $N{a}_{2}S{O}_4$ is electrolysed using platinum electrodes. The product at anode and cathode, respectively are:

1. 
2. 
3. 
4. 

Q.

What is the meaning of electrochemistry?

Q.

Name the gas that evolved at cathode and anode when water is electrolysed. State their ratio by volume.

Q.

Why electrolysis of an aqueous solution of Sodium sulfate $N{a}_{2}S{O}_4$ containing litmus develops a blue colour at the cathode and red colour at the anode?

Q.

Hydrogen is prepared by the ___ of water using platinum electrode.

Q.

From the given diagram of electrolysis of water choose the correct statement.

1. 2 volumes of oxygen at cathode, 2 volumes of hydrogen at anode.

2. 1 volume of oxygen at cathode and 1 volume of hydrogen at anode.

3. 2 volumes of oxygen at anode and 2 volume of hydrogen at cathode.

4. 2 volumes of hydrogen at cathode and 1 volume of oxygen at anode.

Q.

In the electrolysis of acidulated water, _______ gas is evolved at anode.

1. hydrogen sulphide

2. hydrogen

3. oxygen

4. nitrogen

Q.

What can be used as a catalyst for Hydrogen peroxide?

Q.

E. Tick the most appropriate answer:

2. The equation $\mathrm{Zn}+\mathrm{HCl}\to {\mathrm{ZnCl}}_2+{\mathrm{H}}_2$ , the equation can be balanced by putting.

1. 2 in front of $\mathrm{Zn}$ on the side reactants.

2. 2 in front of $\mathrm{HCl}$ on the side reactants.

3. 2 in front of ${\mathrm{ZnCl}}_2$ on the side products.

4. 2 in front of ${\mathrm{H}}_2$ on the side products.

Q.

Name the gas that evolved at cathode and anode when water is electrolysed. State their ratio by volume.

Q. <!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> What are strong and weak electrolytes? [4 Mark]

Q. Which of the following statements are correct regarding the process of electrolysis of water?

1. ${\text{H}}^{+}$ ions move towards the cathode.
2. ${\text{OH}}^{-}$ ions move towards the anode.
3. Oxygen gas evolves at the cathode.
4. Hydrogen gas evolves at the cathode.

Q. On electrolysis of molten sodium chloride, the gas evolved at anode is:

1. chlorine
2. hydrogen
3. hydrogen sulphide
4. nitrogen

Q.

When do we get to see halogen gas forming at the anode?

1. If the electrolyte has oxides

2. If the electrolyte has polyatomic ion in it

3. If the electrolyte has halogen in it

4. If the electrolyte is charged up by HCl acid

Q. What is the ratio of the volume of hydrogen produced to the volume of oxygen?

1. 2:1
2. 1:2
3. 1:3
4. 3:1

Q.

Sugar solution is an electrolyte.

1. True

2. False

Q.

Highly pure hydrogen (99.9% ) can be obtained from:

1. Electrolysis of water

2. Electrolysis of heavy water

3. All of the above

4. Reacting Zn with Dil H₂SO₄

Q.

When water is electrolyzed, which gas is collected at the cathode?

1. Sulphur

2. Oxygen

3. Hydrogen

4. Sulphur Dioxide

Q. Which one of the following is not an electrolyte?
(a) salt solution
(b) sulphuric acid in water
(c) copper sulphate solution
(d) mercury