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N2O
Cl2O
OF2
H2O
Oxygen was independently discovered by
Ozone depletion in the atmosphere is mainly caused by
Ozone layer of atmosphere absorbs:
Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of
Passing a battery current through a solution of brine will produce
Permanent - hardness of water may be removed by addition of
Permanent hardness of water is due to the presence of ?
Petroleum consists of a mixture of
Petroleum is a mixture of
pH scale ranges from