ICSE ICSE Class 7 - CISCE Question Bank Solutions

Give reason for the following:

Even though rusting is an exothermic reaction, the heat evolved when an iron nail rusts is unnoticeable.

Give reason for the following:

Electrolytic decomposition of water is a reaction involving change of state.

Give reason for the following:

A characteristic change of colour is seen when a piece of iron is added to copper [II] sulphate solution.

Give reason for the following:

The catalytic oxidation of sulphur dioxide to sulphur trioxide is represented by a double arrow {⇌} 
between the reactants and products, formed in the chemical reaction.

Name the following:

The products obtained during ‘photosynthesis’ – which is a chemical change.

Name the following:

The type of change physical or chemical involved – ‘during respiration in human beings’.

Differentiate between the terms elements, compounds, and mixtures with suitable examples.

Tick the most appropriate answer.

 The different constituents of ink are separated by

A _______ is formed when one liquid is dispersed as tiny droplets throughout another liquid

Fill in the blanks.

Immiscible liquids are separated by using a ________.

Fill in the blank

Clay is separated from water by the method called ______

Match the ideal method of separation of components in a mixture in List I with the appropriate process in List II.

Name the following:

The non-sublimable solid from a mixture of iodine and potassium nitrate.

Name the following:

The heavier liquid component from mercury and water.

Name the following:

The lower boiling point component from methyl alcohol and water.

Name the following:

The compound containing one atom of sulphur and two atoms of oxygen.

Tick the most appropriate answer

Winnowing is the method used to separate

State the correct technique for the separation of the following mixture.

a lighter liquid from a heavier liquid.

Kerosene and water

• Give the principle involved in the separation of the mixture
• Give the technique of separation of the mixture.

Tick the most appropriate answer.

During filtration the substance left behind on the filter paper is called ________.