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A hot potato -Speak of an issue (mostly current) which many people are talking about and which is usually disputed
Refrigerators keep food unspoiled because
Urea is a —
The resources which can be used continuously year after year ate called
Select the one which is not a mixture:
The chief source of naphthalene is
An atom of an element has atomic number 17 and mass number36 .The number of neutrons in its nucleus is