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Q. It is dangerous to leave the car engine running in a closed garage, because it may cause serious pollution due to poisoning by emission of
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Q. The purity of primary gold is
Q. A substance that removes dirt and grease from surfaces is called
Q. The acid present in lemons and oranges is
Q. In oil wells, oil, water and gas are present in the ascending order of depth
Q. The pH of fresh groundwater slightly decreases upon exposure to air because
Q. The millions period consists of the places ?
Q. In refrigerators, the liquid used as refrigerant is
Q. What is the pH value of a salt made up of a strong acid and a weak base?
Q. An element that does not occur in nature but can be produced artificially is
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