How to write a chemical formula for hydrogen sulphide and Aluminium hydroxide.
And what are their valencies?

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Solution

Aluminium hydroxide - Al( OH)₃

hydrogen sulphide = H₂S

Valencies

In H2S it is -2 bcoz H has +1 state in general
In SO2 it is +4 bcoz O has -2 state in general
So, overall valency of H2S is 2(-ve)

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