ICSE ICSE Class 8 - CISCE Question Bank Solutions for Chemistry

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

Kerosene & water form a _______ mixture.

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

The ratio of hydrogen & oxygen in water is ____.

Give reason for the following:

The percentage of oxygen, in air dissolved in water, is higher than the percentage of oxygen in ordinary air.

Differentiate between the two branches of chemistry – organic chemistry & inorganic chemistry with suitable examples.

State how carbon occurs in the free state and in the combined state.

State in brief the transformation of vegetable matter to different types of coal varying in carbon content.

Carbon dioxide occurs both in the free state and in the combined state.
State three methods how carbon dioxide is added to the atmosphere.

How would you prove experimentally that carbon dioxide does not support combustion.

How would you prove experimentally that is slightly acidic in nature.

Starting from carbon dioxide how would you obtain a weak acid. 
[Give balanced equations for the same]

Starting from carbon dioxide how would you obtain a fertilizer.
[Give balanced equations for the same]

Starting from carbon dioxide how would you obtain a highly poisonous gas.
[Give balanced equations for the same]

Starting from carbon dioxide how would you obtain a black particles of carbon.
[Give balanced equations for the same]

State how you would convert carbon dioxide to a metallic carbonate using a basic oxide e.g. sodium oxide. [Give a balanced equation]

‘When carbon dioxide is bubbled into lime water, the lime water turns milky and when bubbled in excess the milkiness disappears’. Give balanced equations to support the statement.

Explain the term ‘dry ice’. State its application.

Give reason why carbon monoxide is considered a highly poisonous gas. State why it is dangerous to sleep in a closed room with a fuel burning.

Give reason why carbon monoxide is considered a highly poisonous gas. State why it is dangerous to be in the vicinity of smokers.

Convert carbon monoxide to carbon dioxide using two different methods.

State how carbon monoxide finds application in the metallurgy of iron. [Give balanced equations for the same]