The most serious air pollutant causing health hazard is
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Alkali metals can
______ decreases the rate of setting of cement.
Lime water turns milky when carbon dioxide is passed through it. It is due to the formation of
The main mineral constituents of the continental mass are ________ and alumina.
Which chemical is present in the cells of cork of tree which makes them impervious to gases and water
Bauxite is used as raw material by which industry
Who was the first man to go to space?
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