____ is the most electropositive and ___ is the most electronegative element of the third period of modern periodic table.
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Which gas contributes most to the Greenhouse effect?
Aromatic hydrocarbons contain at least _____ benzene like ring in their molecules.
The most abundant element in the earth's atmosphere is
The elements known as primary nutrients for plants
In an acid base reaction which product is produced along with a salt?
Which method will be employed to test the hardness of water?
According to Dalton’s Atomic Theory, the smallest indivisible particles of matter is called ______.
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