ICSE ICSE Class 8 - CISCE Question Bank Solutions

Elements are broadly classified into metals and non-metals. State six general differences in the physical properties of metals and non-metals. State two metals and two non-metals which contradict with the general physical properties – giving reasons. State one difference in property between metalloids and noble gases.

With reference to elements – define the term ‘molecule’. Give two examples each of a monoatomic, diatomic & polyatomic molecule.

Define the term ‘compound’. In the compound carbon dioxide – the elements carbon & oxygen are combined in a fixed ratio. Explain.

State five different characteristics of compounds.

Give three differences between elements & compounds with relevant examples.

Explain the term ‘mixture’.

Differentiate between homogenous & heterogeneous mixtures.

State why brass is considered as a homogenous mixture while a mixture of iron & sulphur – heterogenous.

Give an example of two liquids which form homogenous.

Give an example of two liquids that form heterogeneous mixtures.

Select the correct answer from A, B, C, D & E for the statement given below :

A diatomic molecule.

Select the correct answer from A, B, C, D & E for the statement given below :

A metalloid.

Select the correct answer from A, B, C, D & E for the statement given below :

A non-metal that is lustrous.

Select the correct answer from A, B, C, D & E for the statement given below :

A mixture consisting of elements & a compound.

Select the correct answer from A, B, C, D & E for the statement given below :

A noble gas.

Match the separation of components in List I with the most appropriate process in List II.

The diagram represents fractional distillation for the separation of mixtures. Answer the following :

1. Can two immiscible liquids be separated by this process?
2. Separation of liquids by this process is based on which physical property?
3. If methyl alcohol & water are to be separated, which liquid would remain in flask ‘X’ after condensation.
4. Give a reason for the above answer.
5. State the purpose of the fractionating column in the apparatus.

Select the correct answer from the choice given below to complete the sentence :

Dust in air is an example of _________ mixture.

Select the correct answer from the choice given below to complete the sentence :

Compounds are ____________ in nature.

Select the correct answer from the choice given below to complete the sentence :

An example of a monoatomic molecule is ___________.