Question

In litmus paper test $HCl$ gas turns moist litmus paper from blue to red as it is acidic in nature.

Answer 1

1) In litmus paper test HCl gas turns moist litmus paper from blue to red as it is acidic in nature.
2) In moist universal indicator paper it turns to red shoeing the gas is acidic in nature.
3) HCl gas with ammonia gives white smoke or fumes of ammonium chloride.