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514.72 = ? – 172.03 ? = 514.72 + 172.03 ? = 686.75
The mass number of a nucleus is
The chemical bahaviour of an atom depends upon
Taj Mahal is greatly affected due to:
When water itself combines chemically with some element or mineral it is called
The major component in the LPG is
Burning pyrites ore gives out
Chemical name of bleaching powder is
Spirit in contact with body gives cool sensation because it is:
Black lung disease occurs in people working in
Which one of the following contributes largely to the greenhouse effect?
