Home / Unit-18 Qualitative Anaylsis / Question
MCQ
A white precipitate with NaOH that dissolves in excess NaOH indicates:
Unit-18 Qualitative Anaylsis
A Cu2+ or Fe3+
B Al3+ or Zn2+
C Ca2+ or Ba2+
D Na+ or K+
Explanation

Amphoteric hydroxides of Al and Zn dissolve in excess NaOH.

Related MCQs

Which is the correct laboratory safety practice?
Unit-18 Qualitative Anaylsis View
To detect the sulfate ion in a salt solution, which reagent is added?
Unit-18 Qualitative Anaylsis View
Which anion turns silver nitrate solution into a white precipitate?
Unit-18 Qualitative Anaylsis View
The flame test is an example of a:
Unit-18 Qualitative Anaylsis View
Aqueous solutions of copper(II) salts are usually:
Unit-18 Qualitative Anaylsis View
Which set of observations confirms an ammonium salt?
Unit-18 Qualitative Anaylsis View