Cut pieces of beetroot do not leave colour in cold water but do so in hot water. Explain.

Purple cabbage leaves do not loose their colour in cold water but they do so in boiling water because ..............

Industries are pouting poisons into water. Explain.

The surface tension of cold water is that of hot water

Blue colour of water in sea is due to

A metal which does not react with cold water but reacts with steam

Explain autoionization of water.

How do you perceive the colour of an object?

Answer the following question in one sentence : Which of the following metals do not react with cold water or hot water?

Sugar crystals do not dissolve easily in ice cold water. Explain.

What do you mean by 'Notochord'? Explain.