Q4 of 56 Page 84

Write true or false for the following statements:

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

True

Formula for cupric oxide:


Valency of cupric = 2


Valency of oxide = 2


By applying criss-cross method:



Formula: CuO


Formula for cuprous oxide:


Valency of cuprous = 1


Valency of oxide = 2


By applying criss-cross method:



Formula: Cu2O


Hence, the given statement is correct.


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Write true or false for the following statements:

Sodium shows valency of Na+ and Na2+.

 3

Write true or false for the following statements:

Iron shows valency of Fe2+ and Fe3+.

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Write true or false for the following statements:

The elements having one valency are called monovalent.

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Write true or false for the following statements:

A group of atoms carrying a charge are called bivalent ions.