(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Chemistry

Give reason for the following:

Covalent compounds have a low melting and boiling point.

Identify the following:

A bond formed between two atoms by sharing of a pair of electrons, with both electrons being provided by the same atom.

Select the ion in the following case, that would get selectively discharged from the aqueous mixture of the ions listed below:

\[\ce{SO^2-_4, NO^-_3 {and} OH-}\]

Select the ion in the following case, that would get selectively discharged from the aqueous mixture of the ions listed below:

Pb²⁺, Ag⁺ and Cu²⁺

Name two substances in the following case:

Contain only ions.

Explain the following:

On electrolysis of dilute copper (II) sulphate solution, copper is deposited at the cathode but no hydrogen gas evolves there. Explain why?

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?

Arrange the following according to the instruction given in bracket:

Cu²⁺, Na⁺, Zn²⁺, Ag⁺ (The order of Preferential discharge at the cathode)

Name two substances in the following case:

Contain ions as well as molecules.

Identify the substance underlined, in the following case

The electrolyte used for electroplating an article with silver.

Name the following :

The process of coating of iron with zinc

Name the metallic ions that should be present in the electrolyte when an article made of copper is to be electroplated with silver.

Give reasons why In the electroplating of an article with silver, the electrolyte sodium argentocyanide solution is preferred over silver nitrate solution.

State one relevant observation for the following:

At the anode when aqueous copper sulphate solution is electrolysed using copper electrodes.

Copy and complete the following table:

Choose the correct answer from the options given below:

The electrolyte used for electroplating an article with silver is

A. Silver nitrate solution

B. Silver cyanide solution

C. Sodium argentocyanide solution

D. Nickel sulfate solution

Give one word or phrase for the following:

Electrolytic deposition of a superior metal on a baser metal.

Out of Cu and Ag, which is more active?

How would you change Cu²⁺ ion to Cu?

An electrolytic cell is set up using two platinum electrodes and an aqueous solution of copper (II) sulphate,
(a)draw a labelled diagram of the electrolytic cell,
(b)Name the ions present in the cell,
(c)Name the ions migrating towards the anode,
(d)Name the ions migrating towards the cathode,
(e)Name the ions which will not be discharged at electrodes during electrolysis,
(f)Write the reaction at the cathode,
(g)Write the reaction at the anode,
(h)Name the spectator ion in the solution.