Question

why does dry hcl gas not change the colour of red litmus?

Answer 1

Answer:

dry HCL gas not change the colour of red litmus paper because HCL dissociates into ions only in aqueous form and show acidic behaviour

thus HCL gas not change the colour of blue Litmus paper to red

equation--

HCl + H2O ---------> H3O(+) + Cl(-)