Question

what is the valency of hydrochloric acid

Answer 1

Hii..


here is your answer. . ..


HCL have vacancy +7, +1 and +2 respectively. .


hope it helps you. . ☺

Answer 2

Hello....!!! 

one atom of Hydrogen combines with one atom of chlorine to form Hydrochloric acid !
hydrogen has a valencey 1 and chlorine has valencey 7 
chlorine required 1 elecron to complete it's octet to attain nearest nobel gas structure..

so it's take one elecron from hydrogen to stable itself.. 

hope it's helps you!!