ICSE ICSE Class 7 - CISCE Question Bank Solutions

Define: Mass number : 

Define: Atomic weight :

What are oxides ? 

Give two examples of metallic oxides.

What do you observe when Sulphur is heated and then tested with moist blue and red litmus – paper?

Complete and balance the following chemical equation.

\[\ce{KClO3 ->[heat]  ??   + O2}\]

Which one of the following is most likely to be corroded?

What happens when the mercuric oxide is heated?

What happens when Phosphorus burns in oxygen? Also, give the balanced chemical equation for the reaction.

Classify Copper oxide. Also give a balanced equation to prepare it.

Classify Sulphur dioxide. Also give a balanced equation to prepare it.

Classify Phosphorus pentoxide. Also give a balanced equation to prepare it.

Classify Magnesium oxide. Also give a balanced equation to prepare it.

Describe your observations when potassium nitrate crystals are heated strongly in a test tube and a glowing splint is held near the mouth of test tube.

How will you prove that oxide formed by sulphur is acidic in nature?

Write fully balanced equation for the following :

P₂O₅    +   H₂O   →

Define a chemical change. Give two examples of the above changes.

Change is the law of nature and occurs in our everyday life, at all times and in all places. Differentiate between the following change with a suitable example.

Desirable and undesirable change.

Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.

Periodic and non-periodic change

Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.

Slow and fast change.