Question

Name two element that have varible valency . Give the formulae and names of two compound formed by each of these elements.​

Answer 1

Elements showing variable valency include CARBON and HYDROGEN.

compound formed between HYDROGEN and CHLORINE:HCL(hydrochloric acid)

compound formed between carbon and hydrogen:CH4(methane).

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Answer 2

Iron and copper exist in variable valency. For ex., iron exist with +2 and +3. FeO and Fe2O3

Copper exist with +1 and +2. Cu2O and CuO