- 1(current)
Q. No.Which of the following combines with \(Fe ~(II) \) ions to form a brown complex?
1. \(N_2O \)
2. \(NO \)
3. \(N_2O_3 \)
4. \(N_2O_5 \)
1. \(N_2O \)
2. \(NO \)
3. \(N_2O_3 \)
4. \(N_2O_5 \)
Subtopic: Â Detection of Anions |Â Detection of extra elements |
 79%
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Hints
Which of the following anions gives colourless gas during the preliminary test?
(a) \(SO^{2-}_3\)
(b) \(SO^{2-} _4\)
(c) \(NO^-_2 \)
(d) \(CH_3COO^- \)
1. (a), (b) and (d)
2. (b) and (c)
3. (a), (b) and (c)
4. None of the above
(a) \(SO^{2-}_3\)
(b) \(SO^{2-} _4\)
(c) \(NO^-_2 \)
(d) \(CH_3COO^- \)
1. (a), (b) and (d)
2. (b) and (c)
3. (a), (b) and (c)
4. None of the above
Subtopic: Â Detection of Anions |Â Detection of extra elements |
 70%
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Hints
What is the purpose of the borax bead test?
1. To identify the presence of specific metallic ions
2. To determine the acidity of a solution
3. To test for the presence of organic compounds
4. To measure the concentration of a solute
1. To identify the presence of specific metallic ions
2. To determine the acidity of a solution
3. To test for the presence of organic compounds
4. To measure the concentration of a solute
Subtopic: Â Detection of extra elements |
 81%
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Hints
What is the role of borax (sodium borate) in the borax bead test?
1. It acts as a flux to facilitate the formation of a bead.
2. It acts as an indicator for pH changes.
3. It reacts with metal ions to form colored complexes.
4. It stabilizes the flame during heating.
1. It acts as a flux to facilitate the formation of a bead.
2. It acts as an indicator for pH changes.
3. It reacts with metal ions to form colored complexes.
4. It stabilizes the flame during heating.
Subtopic: Â Detection of extra elements |
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Hints
The borax bead test is responded by.
1. Bivalent metals
2. Trivalent metals
3. Light metals
4. Metals which form colored metaborates
1. Bivalent metals
2. Trivalent metals
3. Light metals
4. Metals which form colored metaborates
Subtopic: Â Detection of extra elements |
 86%
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Hints
- 1(current)
Q. No.
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