Question

"An element X forms the following compounds
with hydrogen, carbon and oxygen
H2X, CX2, XO2, XO3
State the three valencies of element X which are illustrated
by these compounds.".
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Answer 1

Answer:

X is sulphur.

it has valency 2 but it's oxidation states may vary.

Explanation:

valency of an element is always the same but oxidation state varies depending on the reaction taking place