Question

Explain the terms valency and variable valency. Give two examples for each

Answer 1

Explanation:

valency means the combining power of an element, and it is measured by the number of hydrogen atoms it can displace or combine with.for example iron can have valency of both 2 and 3. variable valency means Some elements differ in their capacity to combine with other elements depending on the nature of the reaction.

for example iron combines with oxygen to form ferrous oxide as well as ferric oxide.

Answer 2

Explanation:

Valency: The combining power of an element, especially as measured by the number of hydrogen atoms is called valency.

Ex: Carbon always has a valency of 4

Lithium always has valency of 1

Variable Valency: Some elements differ in their capacity to combine with other elements depending on the nature of the reaction; this property is called variable valency.

Ex: The iron in ferrous oxide exhibits a valency of +2, whereas in ferric oxide, it has a valency of +3.

Copper combines with oxygen to form cuprous oxide (Cu2O) and cupric oxide (CuO).

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