What Will be the effect of these salts using either blue or red litmus paper on hydrolysis?

Copper chloride (CUCl2)
Copper sulphate (CUSO4)
Barium chloride (Bacl2)
Ammonium chloride (NH4Cl)

2 answers

consider how they were formed and the reverse equilibrium reaction:
Cu(OH)2 + 2HCl >> CuCl2 + 2H2O The reverse reaction will be strong acid, weak base, so litmus will be red
Cu(OH)2 + H2SO4>>CuSO4 + 2H2O... reverse reaction produces strong acid, weak base, litmus red.
NH4 (OH) + HCl >>NH4CL + H2O reverse, acid.
https://www.jiskha.com/questions/1795599/What-will-be-the-effect-of-these-salts-using-either-blue-or-red-litmus-paper-on-hydrolysis