Question

which change is observed on deeping a ltmus paper i aqueous solution of MgO

Answer 1

Red to blue means this is base

Answer 2

Is there no change in both the blue and the red litmus papers when salt is dissolved in water? When common salt is dissolved in water, does the litmus red turn blue? ... Aqueous solution of salt of strong acid and weak base is acidic,hence it turns blue litmus red.e.g. NH₄Cl,FeCl₃ ...