Air ___________________ are the substances which contaminate the air.
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Which of the following is essential for the synthesis of thyroxin?
The most abundant element in the earth's atmosphere is
Name the reddish brown gas evolved when Lead Nitrate is heated strongly.
Zeolite is
Nitrification is the biological process of converting
Which of the following statement is CORRECT?
Atomic number of which of the following elements is greater than that of Aluminium?