ICSE ICSE Class 7 - CISCE Question Bank Solutions

Write true or false  :
No new substance is formed during a chemical reaction.

Write true or false  : 

Hydrogen sulphide has rotten egg smell .

Write true or false :

When potassium iodide solution is added to lead acetate solution a red precipitate is formed.

Write true or false .
A black residue is formed when sugar is heated .

Write true or false :

When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet .

Write true or false.

A chemical equation gives only qualitative information of a chemical reaction.

A chemical equation is a statement that describes a chemical change in terms of

Balancing a chemical equation is based on

Copper carbonate when heated, it turns :

State four conditions necessary for a chemical reaction to take place.

Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical reaction.

Balance the following equation :

Fe + H₂O → Fe₃O₄ + H₂

State what you would observe when the following substance is heated in a glass test tube red lead.

State what you would observe when the following substance is heated in a glass test tube Copper (II) carbonate Red lead .

Explain the following reaction with one suitable example of Combination reactions .

Explain the following reaction with one suitable example of Decomposition reaction

Explain the following reaction with one suitable example of Displacement reaction.

Explain the following reaction with one suitable example of Double decomposition reaction.

Name the type of chemical reaction shown by the following equation:

CaCO₃ → CaO + CO₂

Name the type of chemical reaction shown by the following equation:

2Mg + O₂ → 2MgO