[vhpk]

I'm having difficulties with a problem, how to know what the substance is in each bottle ( each bottle has one substance):
ZnCl₂, Cd(NO₃)₂, NH₄NO₃, Al(NO₃)₃
by using only one of these reagents: BaCl₂, KOH, NH₃, HCl, H₂SO₄, purple lacmus .
The problem that I can't solve is that the properties of Zn²⁺ is similar to Cd²⁺.
Thanks for all your help

[hmx9123]

What work have you done?  What properties of these are similar?  Show us your work first.