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Q. Sodium metal is kept under
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Q. The law of constant proportions was enunciated by
Q. Which of the following one of the following is commonly known as 'Pond Silk' -
Q. The absolute value of charge on electron was determined by
Q. The mineral containing both magnesium and calcium is
Q. Which of the following is a radioactive element?
Q. Dry powder fire extinguishers contain
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