Question

Hydrochloric acid valency

Answer 1

Compounds don't have valences, only atoms have valences. 
In the case of HCl, the hydrogen atoms has a valence of 1+ and the chlorine atom has a valence of 1-.

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Answer 2

Hello!!

HYDROCHLORIC ACID (HCl)

The valence depends on the number of unpaired electrons in the outermost shell of the atom's structure

In HCl hydrogen has a valency of +1 and it combines with chlorine to form Hydrochloric acid.

and HCl have not any valencies coz it a compound