Chemistry [1 Mark Question Answer]

When a molten ionic compound is electrolysed, the metal is always formed at …………… and the non-metal is formed at …………..

To carry out the so-called “electrolysis of water”. Sulphuric acid is added to water. How does the addition of sulpuric acid produce a conducting solution?

Explain why:
Solid sodium chloride does not allow electricity to pass through.

Explain why:
Cu, though a good conductor of electricity, is a non-electrolyte.

Name a non-metallic element which is a conductor of electricity.

Name the electrode at which reduction occurs.

Name a positively charges non-metallic ion.

Name an inert electrode and an active electrode.

Name a base which is a weak electrolyte.

How would you change a metal like Cu into its ions?

Name a salt which is a weak electrolyte.

Out of Cu and Ag, which is more active?

Among Zn and Cu, which would occur more readily in nature as metal and which as ion?

Define the following term:
Weak electrolyte

Define the following term:
Cation and anion

Name two substances in the following case:
Contain ions as well as molecules.

Name two substances in the following case:
Contain only ions.

Name two substances in the following case:
Contain only molecules.

Explain the following :
Zinc can produce hydrogen on reacting with acids but copper cannot.

Explain the following :
When a dilute aqueous solution of sodium chloride is electrolysed between platinum electrodes, hydrogen gas is evolved at the cathode but metallic sodium is not deposited. Why?

Explain the following :
On electrolysis of dilute copper (II) sulphate solution, copper is deposited at the cathode but hydrogen gas evolves there.

What ions must be present in a solution used for electroplating a particular metal?

If HX is a weak acid, what particles will be present in its dilute solution apart from those of water?

What kind of particles will be found in a liquid compound which is a non- electrolyte?

Give reason for the following:
carbon tetrachloride is a liquid but does not conduct electricity.

Give a reason for the following:
Potassium is not extracted by electrolysis of its aqueous salt solution.

Give reason for the following:
for electroplating with silver, silver nitrate is not used as electrolyte.

Give a reason for the following:
A graphite anode is preferred to other inert electrodes during electrolysis of fused lead bromide.

Give a reason for the following:
Ammonia is unionized in the gaseous state but in the aqueous solution, it is a weak electrolyte.

Give reason for the following:
In the electrolysis of acidified water, dilute sulphuric acid is preferred to dilute nitric acid for acidification.

Give reason for the following:
Aluminium is extracted from its oxide by electrolytic reduction and not by convectional reducing agents.

Give reason for the following:
The blue colour of aqueous copper sulphate fades when it is electrolysed using platinum electrodes.

Impurities which remain behind at the bottom of the cell.

A suitable cathode used in the electrorefining of copper.

Electrolyte used in the process of nickel plating.

Electrolyte used in the process of silver plating.

Electrolytic deposition of a superior metal on a baser metal.

A material used for making attackable electrodes.

Inert electrodes used in electrolysis of copper sulphate.

The acid used in electrolysis of water.

The process by which an electrovalent substance breaks up into free mobile ions in the molten or aqueous form.

The process by which a particle gains or loses electrons.

The type of materials which neither in solution nor in molten state allows an electric current to pass through it.