ICSE ICSE Class 7 - CISCE Question Bank Solutions

State a specific reason for using zinc in galvanizing

State a specific reason for using lead in bullets

State a specific reason for using magnesium in fireworks.

Give reason for the following:

Galvanized steel is not used for articles used for edible applications.

Give word equation for the reaction of Non-metal:

Sulphur

Give word equation for the reaction of Non-metal:

carbon

Give word equation for the reaction of Non-metal:

phosphorus

Give word equation for the reaction of metal is:

sodium

Give word equation for the reaction of metal is:

calcium

Give word equation for the reaction of metal is:

magnesium with oxygen

Name the following:

The product formed on oxidation of phosphorus.

Name the following:

The chemical name of rust.

State four differences between – elements, compounds and mixtures with suitable examples.

Select the correct answer to the statement given below:

The chemical name for dinitrogen oxide [N₂0].

Select the correct answer to the statement given below:

A compound containing carbon, oxygen and calcium.

Select the correct answer to the statement given below:

A metalloid

Select the correct answer to the statement given below:

A non-metal which exists in the liquid state.

Select the correct answer from the choice in the bracket.

The least reactive metal.

Select the correct answer from the choice in the bracket.

The positively charged particle of an atom.

Give a reason for the following statement:

Components in a mixture are present in varying proportions and not in a fixed proportion.