Question

4. Write notes on
a) Variable valency​

Answer 1

Answer:

Sometimes, because of different condition under which achemical reaction takes place the valency of the same element changes. Thus metals like lead, tin, copper, Mercury iron etc exhibit a variable valency.

Normally the metals donate electrons from their valence shell so atoms to form positively charged ion. However, some matter lose electrons from the shell next to the valence shell. In such situation the element exhibits more than one electropositive valency . Such elements are said to have variable valency.

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Answer 2

Answer:

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Explanation:

Some elements differ in their capacity to combine with other elements depending on the nature of the reaction; this property is called variable valency. For example, the iron in ferrous oxide exhibits a valency of +2, whereas in ferric oxide, it has a valency of +3.