Acid Rain has pH value of
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Biogas is produced from biomass by
Which of the following is NOT correctly matched?
Which one of the following is not a borderline element?
When two liquids do not mix with each other to form a solution, what is it called?
Which of the following gases turns lime water milky?
The credit for classifying the elements on the basis of their atomic masses goes to
Which of the following metals cannot be easily cut with a knife?
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