Methane contributes towards global warming so it is called a _________________ gas.
The chemical formula of Ammonia is _____ .
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Earth's crust mainly contains ______.
Atomic number of which of the following elements is greater than that of Phosphorus?
Which of the following elements has the lowest melting point?
The common name of lead (II) sulphide is
The Chemical formula of Ammonium sulphate is
The series of processes by which nitrogen and its compounds are inter-converted in the environment and in living organisms is called _____ .
Atomic number of which of the following elements is greater than that of Aluminium?
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