Which of the following is most important for absorption of heat radiated from the Sun as well as from the Earth?
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Which one of the following nonmetals shows allotropy in the liquid state?
Haematite is an ore/mineral of
A solution that is at equilibrium must be
Which of the following is a greenhouse gas or a gas which can deplete the ozone layer?
Which of the following has pH value 7?
Which of the following is not a component of Smog?
Acids that contain Hydrogen and other non-metallic element(s), except Oxygen, are called
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