ICSE ICSE Class 8 - CISCE Question Bank Solutions for Chemistry

Complete the statement by filling the blank with the correct word from the option.

Solubility of a solute is the _______ amount of solute that will saturate 100 g. of water at t°C.

Give reason for the following:

All solutions are homogenous mixtures of a solute in a solvent.

Give reason for the following:

Colloidal solutions exhibit brownian movement.

A chemical reaction may be ‘reversible’ in nature. State the meaning of the term in italics.

Give a reason why a catalyst is used in certain chemical reactions.

Give a balanced equation for the reversible catalytic reaction involving sulphur dioxide as one of the reactants.

Certain thermal decomposition reaction, resulting in the formation of the oxide. Give a balanced equation for the thermal decomposition of the following, which result in the formation of metallic oxide.

Limestone
\[\ce{CaCO3->[\Delta]CaO + CO2}\]

Certain thermal decomposition reaction, resulting in the formation of the oxide. Give a balanced equation for the thermal decomposition of the following, which result in the formation of metallic oxide.

Lead carbonate
\[\ce{PbCO3->[\Delta]PbO + CO2}\]

Certain thermal decomposition reaction, resulting in the formation of the oxide. Give a balanced equation for the thermal decomposition of the following, which result in the formation of metallic oxide.

Calcium nitrate
\[\ce{2Ca[NO3]2->[\Delta]2CaO + 4NO2 + O2}\]

Certain thermal decomposition reaction, resulting in the formation of the oxide. Give a balanced equation for the thermal decomposition of the following, which result in the formation of metallic oxide.

Calcium hydroxide
\[\ce{Ca[OH]2->[\Delta]CaO + H2O}\]

State the meaning of the term ‘oxide’.

Give a balanced equation for the formation of the following oxide –

Sulphur dioxide from a non-metal

Give a balanced equation for the formation of the following oxide –

Zinc oxide from a metal

Give a balanced equation for the formation of the following oxide –

Lead oxide from a mixed Oxide.

Give the example of the acidic oxide, basic oxide, amphoteric oxide and neutral oxide. State which of the oxide react with water to give a base.

Give the example of the acidic oxide, basic oxide, amphoteric oxide and neutral oxide. State which of the oxide react with a base to give salt and water.

Give the example of the acidic oxide, basic oxide, amphoteric oxide and neutral oxide. State which of the oxide react with acids and bases to give salt and water.

Give one example of –
A peroxide

Give one example of –
A mixed oxide

Give one example of –
A dioxide