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Q. The gas that usually causes explosions in coal mines is
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Q. The three elements most needed in common fertilisers are:
Q. Which of the following gas is used for converting vegetable oils into saturated fats -
Q. Cadmium rods are used in a nuclear reactor
Q. Which one element from below list is liquid at room temperature?
Q. Biotechnologically, interferon is produced by using
Q. Which of the following is a radioactive element?
Q. The pH of fresh groundwater slightly decreases upon exposure to air because
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