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

State the merits of Mendeleev's classification of elements.

Which metal is preferred for the preparation of hydrogen?

from water?

Which metal is preferred for the preparation of hydrogen?

from acid? 

What is noticed if the products are not allowed to escape?

Complete the following word equation:

Sodium hydroxide + zinc → hydrogen + _________

For laboratory preparation of hydrogen, give the following:

materials used

For laboratory preparation of hydrogen, give the following:

method of collection

For laboratory preparation of hydrogen, give the following:

chemical equation

For laboratory preparation of hydrogen, give the following:

fully-labeled diagram 

Give a reason for the following:

Zinc granules are used in the lab preparation of hydrogen.

Give reason for the following:

Purified and dried hydrogen is collected over mercury.

Give reason for the following:

The end of the thistle funnel should be dipped under acid.

Give reason for the following:

Dilute sulphuric acid cannot be replaced by concentrated acid in the preparation of hydrogen.

Choose the correct option:

Elements which show unique nature in the preparation of hydrogen are:

Where does hydrogen occur in a free state?

How did the name 'hydrogen' originate? 

Hydrogen can be prepared with the help of cold water. Give a reaction of hydrogen with:

A monovalent metal