Same chapter3 marksDifficulty: Medium
What is hard water? Distinguish between temporary and permanent hardness and state how each is removed.
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3 marksDifficulty: Medium
What is heavy water, and state two of its uses.
Original Khojo Papers practice question — not from a past board paper.
Answer
Heavy water is deuterium oxide, D2O, in which both hydrogen atoms are the isotope deuterium. It is used as a moderator in nuclear reactors to slow down fast neutrons, and as a tracer in studying reaction mechanisms.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
It is obtained by the prolonged electrolysis of ordinary water.
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