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Q. No.Mark the reaction that is incorrect regarding the confirmatory test for acetate ion:
1.
2.
3.
4.
Subtopic: Detection of the functional groups |
Level 3: 35%-60%
Hints
A salt gives MnO2 , a light greenish-yellow pungent gas and effervescence on heating with conc. \(\mathrm{H}_2 \mathrm{SO}_4\):
This indicates the ions present in the salt are:
1. \(\mathrm{I^{-}ions.} \)
2. \(\mathrm{Br^{-}ions.} \)
3. \(\mathrm{Cl^{-}ions.} \)
4. \(\mathrm{S^{2-}ions.} \)
This indicates the ions present in the salt are:
1. \(\mathrm{I^{-}ions.} \)
2. \(\mathrm{Br^{-}ions.} \)
3. \(\mathrm{Cl^{-}ions.} \)
4. \(\mathrm{S^{2-}ions.} \)
Subtopic: Detection of Anions |
68%
Level 2: 60%+
Hints
The correct representation of A and B in the following reaction are:
| \(\small 4\mathrm{NaCl}+{\mathrm K}_2{\mathrm{Cr}}_2{\mathrm O}_7+6{\mathrm H}_2{\mathrm{SO}}_4\longrightarrow2{\mathrm{KHSO}}_4+\underset{\begin{array}{c}\text{ (Chromyl }\\\text{ chloride) }\end{array}}{\mathbf A}\\\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\small +4{\mathrm{NaHSO}}_4+3{\mathrm H}_2\mathrm O\) |
| \(\small\begin{aligned} & \left(\mathrm{CH}_3 \mathrm{COO}\right)_2 \mathrm{~Pb}+\underset{\begin{array}{c} \text { Sodium} \\ \text { chromate } \end{array}}{\mathrm{Na_2CrO_4}} \longrightarrow \underset{\begin{array}{c} \text { Lead chromate} \\ \text {(Yellow precipitate)} \end{array}}{\mathbf{B}}+~~2 \mathrm{CH}_3 \mathrm{COONa} \\ \end{aligned}\\ \) |
| 1. | CrO3 and PbCrO4 | 2. | CrO2Cl2 and PbCrO4 |
| 3. | Cr2O7 and Pb CrO4 | 4. | Cr2O7 and PbCl2 |
Subtopic: Detection of Anions |
91%
Level 1: 80%+
Hints
The ion that cannot be precipitated by both \(\mathrm{HCl} \text { and } \mathrm{H}_2 \mathrm{S} \) is:
| 1. | \(\mathrm{Pb}^{2+}\) | 2. | \(\mathrm{Cu}^{+2}\) |
| 3. | \(\mathrm{Ag}^{+}\) | 4. | \(\mathrm{Sn}^{2+}\) |
Subtopic: Detection of Cations |
Level 3: 35%-60%
Hints
Distinguishing reagent between silver and lead salts is:
1. \(\mathrm{H}_2 \mathrm{~S} \text { gas }\)
2. Hot dilute HCl solution
3. \(\mathrm{NH}_4 \mathrm{Cl}(\text { solid })+\mathrm{NH}_4 \mathrm{OH} \text { solution }\)
4. \(\mathrm{NH}_4 \mathrm{Cl} \text { (solid) }+\left(\mathrm{NH}_4\right)_2 \mathrm{CO}_3 \text { solution }\)
1. \(\mathrm{H}_2 \mathrm{~S} \text { gas }\)
2. Hot dilute HCl solution
3. \(\mathrm{NH}_4 \mathrm{Cl}(\text { solid })+\mathrm{NH}_4 \mathrm{OH} \text { solution }\)
4. \(\mathrm{NH}_4 \mathrm{Cl} \text { (solid) }+\left(\mathrm{NH}_4\right)_2 \mathrm{CO}_3 \text { solution }\)
Subtopic: Detection of Cations |
Level 3: 35%-60%
Hints
Find the oxidation state of iron in the brown ring complex, [Fe(H₂O)₅(NO)]SO₄, formed in the test for nitrates.
1. +1
2. +2
3. +3
4. -1
1. +1
2. +2
3. +3
4. -1
Subtopic: Detection of Anions |
75%
Level 2: 60%+
Hints
Identify the incorrect reaction among the following:
| 1. | \(\small{\mathrm{{Na}_2 {SO}_4+{BaCl}_2 → {BaSO}_4 \downarrow +2 {NaCl}} \text {. }}\\ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~\text { (White)}\) |
| 2. | \(\small{\mathrm{{Na}_2 {SO}_4+\left({CH}_3 {COO}\right)_2 {~Pb} → {PbSO}_4 \downarrow+2 {CH}_3 {COONa}}}\\~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(\text { White })\) |
| 3. | \( \small{\begin{aligned} & \mathrm{PbSO}_4+4 \mathrm{CH}_3 \mathrm{COONH}_4 →\\ &~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\left(\mathrm{NH}_4\right)_2\left[\mathrm{Pb}\left(\mathrm{CH}_3 \mathrm{COO}\right)_4\right]+\left(\mathrm{NH}_4\right)_2 \mathrm{SO}_4 \\ &~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ \text {(Insoluble )} \end{aligned}}\) |
| 4. | \(\small{\mathrm{{BaSO}_4({~s})+{Na}_2 {CO}_3({~s}) → {Na}_2 {SO}_4+{BaCO}_3}\downarrow \text { (white) }}\) |
Subtopic: Detection of Anions |
56%
Level 3: 35%-60%
Hints
The oxidation state associated with Nitrogen \(\mathrm { in}~ \mathrm{NO}_3^-\) ion is:
1. +1
2. +5
3. +3
4. +2
1. +1
2. +5
3. +3
4. +2
Subtopic: Detection of Anions |
92%
Level 1: 80%+
Hints
Which element among the following is used to enhance the intensity of \(\mathrm{NO}_2 \) gas?
1. Copper (\(\mathrm{Cu}\))
2. Hydrogen (\(\mathrm{H}\))
3. Neon (\(\mathrm {Ne}\))
4. Manganese (\(\mathrm{Mn}\))
1. Copper (\(\mathrm{Cu}\))
2. Hydrogen (\(\mathrm{H}\))
3. Neon (\(\mathrm {Ne}\))
4. Manganese (\(\mathrm{Mn}\))
Subtopic: Detection of Anions |
65%
Level 2: 60%+
Hints
What is the correct formula for Sodium Nitroprusside?
| 1. | \(\mathrm{Na}_2\mathrm{[Fe(C N)_5 \mathrm{NO}]}\) | 2. | \(K_2[\mathrm{Fe}(\mathrm{CN})_5 Cl]\) |
| 3. | \(\mathrm{Na}_2\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O})_5 \mathrm{NO}\right]\right.\) | 4. | \(\mathrm{Na}_2[\mathrm{Mn}\mathrm{(CN)_5 \mathrm{Br}}]\) |
Subtopic: Detection of Anions |
83%
Level 1: 80%+
Hints
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