ICSE ICSE Class 7 - CISCE Question Bank Solutions for Chemistry

Write ‘True’ or ‘False’ in front of following statement.

The rust formed on the surface of iron easily crumbles. 

Tick (√ ) the most appropriate answer.

Galvanising is the process of coating iron with a layer of molten :

How will you prove that oxide formed by burning sodium is basic in nature?

Write fully balanced equation for the following :

MgO   +   H₂O   →

What is rusting?

State two most important conditions for rusting.

State four ways of preventing rusting.

Write the balanced chemical equation of the manganese dioxide.

With reference to the following metals state their use in daily life metal:

copper

With reference to the following metals state their use in daily life metal:

iron

With reference to the following metals state their use in daily life metal:

Aluminium

With reference to the following metal state its use in daily life:

Magnesium

With reference to the following metals state their use in daily life metal:

Zinc

With reference to the following metals state their use in daily life metal:

Lead

With reference to the following metals state their use in daily life metal:

Silver

Explain the term – rusting and give a word equation for the formation of rust. If polished iron nails are kept in three separate test tubes, state the contents in each test tube required, to prove the conditions for rusting.

State why telegraph poles are painted with aluminium paint.

Give a reason why rust turns moist red litmus blue.

Give a reason why a green deposit is seen on the surface of an article of copper

Give a reason why iron objects rust easily but the iron pillar at Qutab Minar has not rusted over the years.