ICSE ICSE Class 8 - CISCE Question Bank Solutions for Chemistry

How will you obtain Zinc chloride from zinc.

Also give balanced equations for the reactions

Define an oxidation reaction.

Define reduction.

Define redox reaction.

What do you observe when Magnesium ribbon is burnt in oxygen.

What is meant by the metal reactivity series ? State its importance, (any two points).

MULTIPLE CHOICE QUESTIONS

The process of adding oxygen to a substance is called

1. oxidation.
2. reduction.
3. displacement.
4. hydrogenation.

TRUE \ FALSE

Hydrogen is a good oxidizing agent.

What do you mean by a saturated solution ?

Give a reason for the following:

An excess of carbon dioxide increases the temperature of the earth.

Where is the nucleus of an atom situated? 

 Complete and balance the following equation:

H₂ + S → ___________

Complete and balance the following equation:

Zn +_________________→ZnCl₂ + H₂ 

Complete and balance the following equation:

CuO +__________→ Cu +___________

Complete and balance the following equation:

\[\ce{K + H2O -> }\]________+ ________

Complete and balance the following equation:

Fe + H2O →___________+____________

State a reason why, when hydrogen is passed over heated copper oxide, the resultant product formed, differs in colour from the original reactant.

With reference to oxidation & reduction reaction – complete the statement given by filling in the blanks with only the words (a) Addition (b) Removal.

‘Oxidation is a chemical reaction involving ____ of oxygen to a substance or ____ of hydrogen from a substance. Reduction on the otherhand involves ____ of hydrogen to a substance or ____ of oxygen from a substance.

If 5 g. of a solute is added to 50 ml. of a solvent at a particular temperature and the solution can dissolve more of the solute at that temperature – is the solution obtained a saturated or an unsaturated solution. Give reasons.

Explain the meaning of the term ‘saturated solution’. State two methods to convert a saturated solution to an unsaturated solution.