The most serious air pollutant causing health hazard is
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Who was the first man to go to space?
Kidney stones are composed of ______.
The main mineral constituents of the continental mass are ________ and alumina.
Which of the following is a chemical formula of quicklime?
Which of the following is NOT a nucleon?
Which of the following elements has the lowest melting point?
How many elements are present in the group of the 18th Modem Periodic Table?