Select Chapter Topics:
Q. No.What is the color change observed during the titration of Mohr's salt with potassium permanganate?
1. From blue to colourless
2. From pink to colourless
3. From green to brown
4. From yellow to pink
Subtopic: The chemistry involved in the titrimetric exercises |
Level 4: Below 35%
Hints
Which of the following is a confirmatory test for the presence of \(\mathrm{Hg}^{ 2+}\) ions in salt analysis?
| 1. | Formation of yellow precipitate with sodium carbonate. |
| 2. | Formation of brown precipitate with hydrochloric acid. |
| 3. | Formation of white precipitate with ammonium hydroxide. |
| 4. | Formation of red precipitate with potassium iodide. |
Subtopic: Detection of Cations |
Level 3: 35%-60%
Hints
What is the chemical formula of the complex formed when \(\mathrm{Hg}^{2+}\) ions react with excess potassium iodide?
1. \(\mathrm{HgI}\)
2. \(\mathrm{HgI}_ 2\)
3. \(\mathrm{HgI}_3^{-}\)
4. \(\mathrm{HgI}_ 4^{ 2-}\)
1. \(\mathrm{HgI}\)
2. \(\mathrm{HgI}_ 2\)
3. \(\mathrm{HgI}_3^{-}\)
4. \(\mathrm{HgI}_ 4^{ 2-}\)
Subtopic: Detection of Cations |
63%
Level 2: 60%+
Hints
Subtopic: Detection of Cations |
75%
Level 2: 60%+
Hints
Which of the following complex ions is formed when manganese ions react with excess ammonia in aqueous solution?
1. \([Mn(NH_3)_6]^{2+}\)
2. \([Mn(NH_3)_4]^{2+}\)
3. \([Mn(NH_3)_6]^{3+}\)
4. \([Mn(NH_3)_4]^{3+}\)
1. \([Mn(NH_3)_6]^{2+}\)
2. \([Mn(NH_3)_4]^{2+}\)
3. \([Mn(NH_3)_6]^{3+}\)
4. \([Mn(NH_3)_4]^{3+}\)
Subtopic: Detection of Cations |
60%
Level 2: 60%+
Hints
What is the color of the flame produced when a salt containing Ba ions is heated on a platinum
wire in a Bunsen burner flame?
1. Yellow-green
2. Red
3. Grassy green
4. Purple
wire in a Bunsen burner flame?
1. Yellow-green
2. Red
3. Grassy green
4. Purple
Subtopic: Detection of Cations |
58%
Level 3: 35%-60%
Hints
How can cobalt ions be distinguished from nickel ions in salt analysis?
| 1. | Cobalt ions form a pink precipitate with ammonia, while nickel ions form a green precipitate. |
| 2. | Cobalt ions form a blue precipitate with sodium hydroxide, while nickel ions form a green precipitate. |
| 3. | Cobalt ions react with potassium ferrocyanide to form a blue precipitate, while nickel ions do not. |
| 4. | Cobalt ions form a red-brown precipitate with potassium iodide, while nickel ions do not react. |
Subtopic: Detection of Cations |
Level 3: 35%-60%
Hints
Which complex ion is formed when cobalt ions react with ammonia in the presence of chloride ions?
| 1. | \([Co(NH_3)_6]^{3+}\) | 2. | \([Co(NH_3)_6]^{2+}\) |
| 3. | \([CoCl(NH_3)_5]^{4+}\) | 4. | \([Co(NH_3)_5Cl]^{2+}\) |
Subtopic: Detection of Cations |
57%
Level 3: 35%-60%
Hints
Which of the following cations will turn a borax bead green when heated in a reducing (luminous) flame?
| 1. | \(\mathrm{Fe^{3+}}\) | 2. | \(\mathrm{Cu^{2+}}\) |
| 3. | \(\mathrm{Mn^{2+}}\) | 4. | \(\mathrm{Ni^{2+}}\) |
Subtopic: Detection of Cations |
Level 3: 35%-60%
JEE
Please attempt this question first.
Hints
Match the reagents from List-I with the corresponding radicals from List-II and choose the correct option:
| List-I (Reagent) |
List-II (Radical) |
||
| (i) | \(\text { dil. } \mathrm{HCl}\) | (A) | \(\mathrm{Pb}^{2+}\) |
| (ii) | \(\begin{aligned} & \mathrm{NH}_4 \mathrm{Cl}+\mathrm{NH}_4 \mathrm{OH}+ \\ & \left(\mathrm{NH}_4\right)_2 \mathrm{CO}_3 \end{aligned}\) | (B) | \(\mathrm{Al}^{3+}\) |
| (iii) | \(\mathrm{NH}_4 \mathrm{Cl}+\mathrm{NH}_4 \mathrm{OH}+\mathrm{H}_2 \mathrm{~S}\) | (C) | \(\mathrm{Mn}^{2+}\) |
| (iv) | \(\mathrm{NH}_4 \mathrm{Cl}+\mathrm{NH}_4 \mathrm{OH}\) | (D) | \(\mathrm{Sr}^{2+}\) |
| 1. | (i)-(A), (ii)-(D), (iii)-(C), (iv)-(B) |
| 2. | (i)-(D), (ii)-(A), (iii)-(C), (iv)-(B) |
| 3. | (i)-(A), (ii)-(D), (iii)-(B), (iv)-(C) |
| 4. | (i)-(B), (ii)-(C), (iii)-(D), (iv)-(A) |
Subtopic: Detection of Cations |
68%
Level 2: 60%+
JEE
Please attempt this question first.
Hints
Select Chapter Topics:
© 2026 GoodEd Technologies Pvt. Ltd.