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Q. A gas which is not present in normal samples of air is
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Q. The most electronegative element among the following is
Q. Which among the following happens in an oxidation reaction ?
Q. The charge on position is equal to the charge on
Q. Which of the following acts both as oxidising and reducing agent?
Q. The purest form of water in nature is
Q. The metal that is usually extracted from sea water is
Q. The substance most commonly used as a food preservative is
Q. The biogas used for cooking is a mixture of which of the following
Q. The weight of a rusted iron object is _________ that of an unrusted one
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