Which of the following is a greenhouse gas or a gas which can deplete the ozone layer?
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Oxide of which of the following will turn red litmus blue?
By volume, 78% of air is _______________
The series of processes by which nitrogen and its compounds are inter-converted in the environment and in living organisms is called _____ .
Which of the following is an unsaturated Hydrocarbon?
Who invented the modern periodic table?
The pH of a solutiion is 3. When its pH changes to 6, then H+ ion concentration
Who formulated ‘the atomic theory’ of a matter?
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