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Q. No.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 |
91%
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 |
68%
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
Which compound is responsible for the green flame in the Borate ion test?
1. \(\left(\mathrm{CH}_3\right)_3 \mathrm{BO}_3\)
2. \(\left(C_2 \mathrm{H}_5\right)_3 \mathrm{BO}_3\)
3. \(\mathrm{H}_3 \mathrm{BO}_3\)
4. \(\mathrm{(C_2 H_5)_3 \mathrm{BO}_4}\)
1. \(\left(\mathrm{CH}_3\right)_3 \mathrm{BO}_3\)
2. \(\left(C_2 \mathrm{H}_5\right)_3 \mathrm{BO}_3\)
3. \(\mathrm{H}_3 \mathrm{BO}_3\)
4. \(\mathrm{(C_2 H_5)_3 \mathrm{BO}_4}\)
Subtopic: Detection of Anions |
54%
Level 3: 35%-60%
Hints
Which gas, characterized by brisk effervescence, causes lime water to turn milky?
| 1. | Nitrogen | 2. | Oxygen |
| 3. | Carbon dioxide | 4. | Hydrogen |
Subtopic: Detection of Anions |
95%
Level 1: 80%+
Hints
The colourless gas that evolved with the smell of rotten eggs is:
| 1. | \(H_2\) | 2. | \(SO_2\) |
| 3. | \(H_2S\) | 4. | \(CO_2\) |
Subtopic: Detection of Anions |
91%
Level 1: 80%+
Hints
Which ion is indicated by the presence of hydrogen sulfide gas?
| 1. | \(SO^{2-}_4\) | 2. | \(S^{2-}\) |
| 3. | \(Cl^-\) | 4. | \(H^+\) |
Subtopic: Detection of Anions |
92%
Level 1: 80%+
Hints
What happens to lead acetate paper when exposed to H2S gas?
| 1. | It turns white | 2. | It remains unchanged |
| 3. | It turns black | 4. | It turns yellow |
Subtopic: Detection of Anions |
91%
Level 1: 80%+
Hints
B in the following reaction is:
\(\small{\mathrm{Cr}_2 \mathrm{O}_7^{2-}+2 \mathrm{H}^{+}+3 \mathrm{SO}_2 \longrightarrow 2 \mathrm{Cr}^{3+} \text { (green) }+B+\mathrm{H}_2 \mathrm{O} .}\)
\(\small{\mathrm{Cr}_2 \mathrm{O}_7^{2-}+2 \mathrm{H}^{+}+3 \mathrm{SO}_2 \longrightarrow 2 \mathrm{Cr}^{3+} \text { (green) }+B+\mathrm{H}_2 \mathrm{O} .}\)
| 1. | SO42- | 2. | OH- |
| 3. | \(SO_3^{-2}\) | 4. | None of the above |
Subtopic: Detection of Anions |
77%
Level 2: 60%+
Hints
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