ICSE ICSE Class 8 - CISCE Question Bank Solutions for Chemistry

Give two examples for Deliquescent substance.

What do you observe when Blue vitriol is heated?

Water turns the colour of anhydrous copper sulphate .................

The sticky substance formed when soap is added to hard water is ______.

Give one word for the following statement:

A substance which does not contain water .

Give one word for the following statement:

A property due to which a substance absorbs water without dissolving.

Give one word for the following statement:

Water molecules in loose chemical combination with other substances.

Suggest a suitable technique to separate the constituents of the following mixtures.  Also give the reason for selecting the particular method.

Ammonium chloride from sand

Suggest a suitable technique to separate the constituents of the following mixtures. Also give the reason for selecting the particular method.

Chalk powder from water

Suggest a suitable technique to separate the constituents of the following mixtures. Also give the reason for selecting the particular method :

Iron from sulphur 

Suggest a suitable technique to separate the constituents of the following mixtures. Also give the reason for selecting the particular method.

Water and alcohol

Suggest a suitable technique to separate the constituents of the following mixtures. Also give the reason for selecting the particular method.

Sodium chloride and potassium nitrate

Suggest a suitable technique to separate the constituents of the following mixtures. Also give the reason for selecting the particular method.

Calcium carbonate and sodium chloride

The process of separation or deposition of crystals from a hot saturated solution on gentle cooling of the solution is called ‘crystallization’. With reference to the statement explain what is meant by ‘water of crystallization. State which physical properties of a crystal are correlated with the water of crystallization.

Differentiate between ‘hydrated’ & ‘anhydrous’ crystals. Give the chemical formula of – the following hydrated crystals -

(a) Washing soda
(b) Gypsum
(c) Blue vitriol
(d) Epsom salt
(e) Glauber’s salt.
State which crystal from (a) to (e) is a pentahydrate.

Differentiate between an efflorescent, deliquescent & ‘ hygroscopic substance with suitable examples.

Differentiate the function of concentrated sulphuric acid as a drying agent & as a dehydrating agent. Is fused calcium chloride a dehydrating or a desiccating agent. Give reasons.

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

Hygroscopic substance absorb moisture from the atmosphere & _______their original state.

Match the substances in List I with the appropriate answer in List II.

Compare the properties of iron [II] sulphide with the iron-sulphur mixture, considering iron [II] sulphide as a compound & particles of iron & sulphur mixed together as an example of a mixture.