____ 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?
The elements known as primary nutrients for plants
In an acid base reaction which product is produced along with a salt?
Air ___________________ are the substances which contaminate the air.
The most abundant element in the earth's atmosphere is
Aromatic hydrocarbons contain at least _____ benzene like ring in their molecules.
Which method will be employed to test the hardness of water?
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