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

In the laboratory preparation of hydrogen from zinc and dil. acid. Give a reason for the following:

The complete apparatus is air-tight.

In the laboratory preparation of hydrogen from zinc and dil. acid. Give a reason for the following:

Dilute nitric acid is not preferred as the reactant acid.

In the laboratory preparation of hydrogen from zinc and dil. acid. Give a reason for the following:

Dilute nitric acid is not preferred as the reactant acid.

In the laboratory preparation of hydrogen from zinc and dil. acid. Give a reason for the following:

The lower end of the thistle funnel should dip below the level of the acid in the flask.

In the laboratory preparation of hydrogen from zinc and dil. acid. Give a reason for the following:

The lower end of the thistle funnel should dip below the level of the acid in the flask.

In the laboratory preparation of hydrogen from zinc and dil. acid. Give a reason for the following:

Hydrogen is not collected over air.

In the laboratory preparation of hydrogen from zinc and dil. acid. Give a reason for the following:

Hydrogen is not collected over air.

Give a reason for the following.

Nitric acid in the dilute form is not used in the laboratory preparation of hydrogen from metals.

Give a reason for the following.

Nitric acid in the dilute form is not used in the laboratory preparation of hydrogen from metals.

Name the following.

A gaseous reducing agent which is basic in nature.

Name the following.

A gaseous reducing agent which is basic in nature.

Select the correct answer from the symbol in the bracket.

The element which forms a diatomic molecule.

Select the correct answer from the symbol in the bracket.

The element which forms a diatomic molecule.

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

laboratory method.

State what is added through the thistle funnel ‘Y’

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

laboratory method.

State what is added through the thistle funnel ‘Y’

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

State what difference will be seen if pure zinc is added in the distillation flask ‘X’ instead of granulated zinc.

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

State what difference will be seen if pure zinc is added in the distillation flask ‘X’ instead of granulated zinc.

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

Name a solution which absorbs the impurity – `"H"_2"S"`

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

Name a solution which absorbs the impurity – `"H"_2"S"`

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.