Match the following items of column A with column B.
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By volume, 21% of air is _______________.
Metals are generally ______.
I. Ductile
II. Malleable
III. Poor conductors of heat
Which species is a conjugate acid of OH- ?
Mass number is always equal to ______.
Water which is suitable for drinking is called _______________ water.
Which of the following is NOT a waste material removed from blood in the kidney?
What is the general formula of alkenes?