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Q. Which gas is used as fire extinguisher ?
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Q. Bleaching action of moist sulphur di-oxide is as of its
Q. The atoms of the elements having same mass number but different atomic number are called
Q. ........... is an alkali metal.
Q. Choose the incorrect pair from the below.
Q. The mass number of a nucleus is
Q. Which among the given is not a gaseous air pollutant
Q. Major gaseous pollutant of the thermal power station is
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