QA

Question 1

Cation

Answer 1

Qualitative Test

Question 2

Ag⁺

Answer 2

Forms white curdy precipitate with Cl⁻ (AgCl), soluble in NH₃

Question 3

Hg⁺

Answer 3

Forms black precipitate with Cl⁻ (Hg₂Cl₂), turns black on standing

Question 4

Cu²⁺

Answer 4

Forms deep blue solution with NH₃ due to [Cu(NH₃)₄]²⁺

Question 5

Pb²⁺

Answer 5

Forms white precipitate with Cl⁻ (PbCl₂), soluble in hot water

Question 6

Fe³⁺

Answer 6

Gives reddish-brown precipitate with NH₃ or NaOH (Fe(OH)₃)

Question 7

Cr³⁺

Answer 7

Gives gray-green precipitate with NH₃ (Cr(OH)₃), soluble in excess NaOH

Question 8

Al³⁺

Answer 8

White gelatinous precipitate with NH₃ or NaOH (Al(OH)₃), dissolves in excess NaOH

Question 9

Ca²⁺

Answer 9

White precipitate with (NH₄)₂C₂O₄ (CaC₂O₄)

Question 10

Ba²⁺

Answer 10

White precipitate with SO₄²⁻ (BaSO₄), insoluble in acids

Question 11

Zn²⁺

Answer 11

White precipitate with NaOH/NH₃ (Zn(OH)₂), soluble in excess

Question 12

Mn²⁺

Answer 12

Gives light pink precipitate with NaOH (Mn(OH)₂), turns brown on oxidation

Question 13

Mg²⁺

Answer 13

White precipitate with NaOH (Mg(OH)₂), no precipitate with NH₃