If the volume is decreased, the density .

(i) increases

(ii) Decreases

Water is a _____ (good / bad) conductor of heat.

Give reason for the following:

Food gets cooked faster in pressure cookers.

Give reason for the following:

Ice-skating is easier compared to moving on ice.

Give reason for the following:

Fish and aquatic animals survive even when the top water freezes to ice.

Give reason for the following:

Ice kept at the bottom of the test tube doesn't melt even when the even when the water at the top starts boiling.

Give reason for the following.

Hydrogen gas on burning forms a liquid.

With respect to the process shown in the figure, answer the following question.

• Give the formula of copper sulphate crystals.