Acid Rain has pH value of
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The number of free electrons in the outermost shell of carbon atoms in diamand is
When two liquids do not mix with each other to form a solution, what is it called?
Which of the following is NOT correctly matched?
Which one of the following is not a borderline element?
The metal that can be cut with a knife is
Which of the following metals cannot be easily cut with a knife?
The credit for classifying the elements on the basis of their atomic masses goes to
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