- 1(current)
Q. No.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%
JEE
Please attempt this question first.
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 |
JEE
Please attempt this question first.
Hints
Identify the inorganic sulphides that are yellow in colour:
(A) (NH4)2S
(B) PbS
(C) CuS
(D) As2S3
(E) As2S5
Choose the correct answer from the options given below :
1. (A) and (C) only
2. (A), (D) and (E) only
3. (A) and (B) only
4. (D) and (E) only
(A) (NH4)2S
(B) PbS
(C) CuS
(D) As2S3
(E) As2S5
Choose the correct answer from the options given below :
1. (A) and (C) only
2. (A), (D) and (E) only
3. (A) and (B) only
4. (D) and (E) only
Subtopic: Detection of Cations |
JEE
Please attempt this question first.
Hints
Identify A, B and C in the given below reaction sequence:
1. PbCl2 , PbSO4 , PbCrO4
2. PbS, PbSO4 , PbCrO4
3. PbS, PbSO4 , Pb(CH3COO)2
4. PbCl2 , Pb(SO4)2 , PbCrO4
1. PbCl2 , PbSO4 , PbCrO4
2. PbS, PbSO4 , PbCrO4
3. PbS, PbSO4 , Pb(CH3COO)2
4. PbCl2 , Pb(SO4)2 , PbCrO4
Subtopic: Detection of Cations |
JEE
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Hints
- 1(current)
Q. No.
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