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Q. The number of isotopes in which hydrogen can exist are
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Q. The substance most commonly used as a food preservative is
Q. The enzyme that hydrolyses cane sugar to glucose and fructose is
Q. Petroleum consists of a mixture of
Q. Which of the following does the nucleus of an atom consists of?
Q. Copper substances when exposed to air gains a green coating due to the formation of:
Q. Acid secretion is characteristic of
Q. In the human body, the most abundant element is
Q. The percentage of nitrogen present in ammonium sulphate is:
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