Q2 of 56 Page 84

Write true or false for the following statements:

Sodium shows valency of Na+ and Na2+.

False

Na shows valency of Na+ because it has only one electron in the outermost shell. It cannot show the valency of Na2+


Hence, the given statement is false.


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20

Which of the following will have maximum mass?

 1

Write true or false for the following statements:

Oxygen molecule exists in the form of three molecules as O2, O3 and O4.

 3

Write true or false for the following statements:

Iron shows valency of Fe2+ and Fe3+.

 4

Write true or false for the following statements:

The formulae of cupric oxide and cuprous oxide are CuO and Cu2O respectively.