(English Medium) ICSE Class 10 - CISCE Important Questions for Chemistry

In the molecule of water, oxygen atom has ______.

Draw the electron dot structure of Methane molecule.

[Atomic number: N = 7, C = 6, H = 1]

Draw the electron dot structure of Nitrogen molecule.

[Atomic number: N = 7, C = 6, H = 1]

Give reason for the following:

Covalent compounds have a low melting and boiling point.

Carbon tetrachloride is a ______ covalent molecule.

The following table shows the electronic configuration of the atoms A, B, C and D.

1. Write the formula of the compound formed between:
   
   1. A and B
   2. D and C
2. Which of the above elements will exhibit catenation?

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.

Choose the correct answer from the options given below

To increase the pH value of a neutral solution, we should add:

1) an acid

2) an acid salt

3) an alkali

4) a salt

Identify the substance underlined, in the following case

A solid formed by reaction of two gases, one of which is acidic and the other basic in nature

Write a balanced chemical equation for the following:

Preparation of methane from iodomethane.

Write a balanced chemical equation for the preparation of the following salts

Copper carbonate 

State what would you observe when Washing Soda Crystals are exposed to the atmosphere

State what would you observe when The salt ferric chloride is exposed to the atmosphere

Identify the anion present in the following compounds:

A salt D on treatment with dilute sulphuric acid produces a gas which turns lime water milky but has no effect on acidified potassium dichromate solution

Identify the anion present in the following compounds:
When barium chloride solution is added to salt solution E a white precipitate insoluble in dilute hydrochloric acid is obtained.

From the list of the following salts choose the salt that most appropriately fits the description is given in the following:

[AgCl, MgCl₂, NaHSO₄, PbCO₃, ZnCO₃, KNO₃, Ca(NO₃)₂]

A deliquescent salt

From the list of the following salts choose the salt that most appropriately fits the description is given in the following:

[AgCl, MgCl₂, NaHSO₄, PbCO₃, ZnCO₃, KNO₃, Ca(NO₃)₂]

An insoluble chloride.

From the list of the following salts choose the salt that most appropriately fits the
description is given in the following:

[AgCl, MgCl₂, NaHSO₄, PbCO₃, ZnCO₃, KNO₃, Ca(NO₃)₂]

On heating, this salt gives a yellow residue when hot and white when cold

From the list of the following salts choose the salt that most appropriately fits the
description is given in the following:

[AgCl, MgCl₂, NaHSO₄, PbCO₃, ZnCO₃, KNO₃, Ca(NO₃)₂]

On heating this salt, a brown colored gas is evolved.

Distinguish between the given pairs of compounds using the test given within brackets:

A lead salt and a zinc salt (using excess ammonium hydroxide)