When water is frozen in glass bottles, it is advised not to fill the bottles completely. Explain the reason.

When sodium metal dissolves in liquid ammonia, it gives a deep blue coloured solution. Explain the reason.

Water is liquid while H_2S is a gas. Suggest reason for the above fact. Explain the phenomenon.

Some features of a reversible reaction are given below: Product formation increase when the temperature is increased. Explain the reason for above inference.

Sodium reacts with water. a. Identify the gas evolved in the reaction. b. If two drops of phenolphthalein is added to the water, what will be colour change of the resultant solution? Explain the reason.

You might have observed the bubbles of steam coming from bottom of vessel when water is heated.These bubbles disappear as it reaches top of liquid just before boiling and they reach the surface at the time of boiling.Explain the reason.

A can is full of milk. It is used to fill three identical bottles. Each bottle is used to fill four cups. What portion of the milk in the can does each cup contain?

When an alkali metal dissolves in liquid ammonia the solution can acquire different colours. Explain the reasons for this type of colour change

When a tea bag is placed in a cup of water, which phenomenon is observed? Explain the phenomenon.