(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Chemistry

The diagram represent the preparation and collection of hydrogen by a standard laboratory method.

State, why hydrogen is collected after all the air in the apparatus, is allowed to escape.

The diagram represent the preparation and collection of hydrogen by a standard laboratory method.

Name a gas other than hydrogen collected by the same method.

The diagram represent the preparation and collection of hydrogen by a standard laboratory method.

Name a gas other than hydrogen collected by the same method.

Explain why a hot saturated solution of potassium nitrate forms crystals as it cools.

If you are given some copper sulphate crystals, how would you proceed to prepare its saturated solution at room temperature?

How can you show that your solution is really saturated?

Which test will you carry out to find out if a given solution is saturated or unsaturated or supersaturated?

State the term:

When a substance absorbs moisture on exposure to moist air and dissolves in the absorbed water and turned to solution.

When a substance absorbs moisture from the atmosphere but does not form a solution.

Explain why:

A solution is always clear and transparent.

State two ways by which a saturated solution can be changed to unsaturated solution.

What is the nature of the charge on Anode rays?

Why are anode rays also called as 'canal rays'?

How does cathode ray differ from as anode rays?

Which sub-atomic particle was discovered by Goldstein.

Name the sub-atomic particle whose charge is +1.

Complete the table given below by identifying P, Q, R and S.

Write down the names of the particles represented by the following symbols and explain the meaning of superscript and subscript numbers attached `""_1"p"^1, ""_0"n"^1,""_-1"e"^0`

What is the significance of the number of protons found in the atoms of different elements?

Complete the table given below