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Q. Which of the given is a covalent compound -
Q. The element not present in fertilisars is
Q. The metal that is usually extracted from sea water is
Q. Rain water helps to increase the _________ to some extent.
Q. Helium is added to the oxygen supply of deep sea divers as it is
Q. One of the following is used to dissolve noble metals. That is
Q. Which among the following is used to dilute oxygen in the gas cylinders used by divers ?
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