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Which among the given is not a nitrogenous fetiliser -
Which among the given is not a noble gas
Which among the given is not a nucleon
Which among the given is not a part of a CRT
Which among the given is not a property of heavy water
Which among the given is not an insectivorous plant -
Which among the given is optical illusion -
Which among the given is present in hard water?
Which among the given is responsible for permanent hardness of water -
Which among the given is responsible for the extra strength of pyrex glass