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Q. No.The correct representation of A and B in the following reaction are:
\(4 \mathrm{NaCl}+\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7+6 \mathrm{H}_2 \mathrm{SO}_4 \longrightarrow 2 \mathrm{KHSO}_4+\underset{\begin{array}{c} \text { (Chromyl } \\ \text { chloride) } \end{array}}{\mathrm{A}}+4 \mathrm{NaHSO}_4+3 \mathrm{H}_2 \mathrm{O} \)
\(\begin{aligned} & \left(\mathrm{CH}_3 \mathrm{COO}\right)_2 \mathrm{~Pb}+\underset{\begin{array}{c} \text { Sodium} \\ \text { chromate } \end{array}}{\mathrm{Na_2CrO_4}} \longrightarrow \underset{\begin{array}{c} \text { Lead chromate} \\ \text {(Yellow precipitate)} \end{array}}{\mathrm{B}}+~~2 \mathrm{CH}_3 \mathrm{COONa} \\ \end{aligned}\\ \)
1. CrO3 and PbCrO4
2. CrO2Cl2 and PbCrO4
3. Cr2O7 and Pb CrO4
4. Cr2O7 and PbCl2
Subtopic: Detection of Anions |
92%
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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. \(\mathrm{Sn}^{2+}\)
1. \(\mathrm{Pb}^{2+}\)
2. \(\mathrm{Cu}^{+2}\)
3. \(\mathrm{Ag}^{+}\)
4. \(\mathrm{Sn}^{2+}\)
Subtopic: Detection of Cations |
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Hints
Mark the incorrect one among the following reactions.
| 1. | \(\small{\mathrm{Na}_2 \mathrm{SO}_4+\mathrm{BaCl}_2\rightarrow \mathrm{BaSO}_4 \downarrow +2 \mathrm{NaCl} \text {. }}\\ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~\text { (White)}\) |
| 2. | \(\small{\mathrm{Na}_2 \mathrm{SO}_4+\left(\mathrm{CH}_3 \mathrm{COO}\right)_2 \mathrm{~Pb} \longrightarrow \mathrm{PbSO}_4 \downarrow+2 \mathrm{CH}_3 \mathrm{COONa}}\\~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(\text { White })\) |
| 3. | \(\small{\mathrm{PbSO}_4+2 \mathrm{CH}_3 \mathrm{COONH}_4 \longrightarrow\left(\mathrm{CH}_3 \mathrm{COO}\right)_2 \mathrm{~Pb} +\left(\mathrm{NH}_4\right)_2 \mathrm{SO}_4}\\~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\text { (Insoluble)}~~~~~~~~~~~~~~~\) |
| 4. | \(\small{\mathrm{BaSO}_4(\mathrm{~s})+\mathrm{Na}_2 \mathrm{CO}_3(\mathrm{~s}) \longrightarrow \mathrm{Na}_2 \mathrm{SO}_4+\mathrm{BaCO}_3\downarrow \text { (white) }}\) |
Subtopic: Detection of Anions |
64%
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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 |
81%
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Which gas, characterized by brisk effervescence, causes lime water to turn milky?
1. Nitrogen
2. Oxygen
3. Carbon dioxide
4. Hydrogen
1. Nitrogen
2. Oxygen
3. Carbon dioxide
4. Hydrogen
Subtopic: Detection of Anions |
95%
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The colourless gas that evolved with the smell of rotten eggs is:
1. \(H_2\)
2. \(SO_2\)
3. \(H_2S\)
4. \(CO_2\)
1. \(H_2\)
2. \(SO_2\)
3. \(H_2S\)
4. \(CO_2\)
Subtopic: Detection of Anions |
90%
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Which ion is indicated by the presence of hydrogen sulfide gas?
1. \(SO^{2-}_4\)
2. \(S^{2-}\)
3. \(Cl^-\)
4. \(H^+\)
1. \(SO^{2-}_4\)
2. \(S^{2-}\)
3. \(Cl^-\)
4. \(H^+\)
Subtopic: Detection of Anions |
93%
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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
1. It turns white
2. It remains unchanged
3. It turns black
4. It turns yellow
Subtopic: Detection of Anions |
92%
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B in the following reaction is :
\(\small{\mathrm{Cr}_2 \mathrm{O}_7^{2-}+2 \mathrm{H}^{+}+3 \mathrm{SO}_2 \longrightarrow 2 \mathrm{Cr}^{3+} \text { (green) }+B+\mathrm{H}_2 \mathrm{O} .}\)
1. SO42-
2. OH-
3. \(SO_3^{-2}\)
4. None of the above
\(\small{\mathrm{Cr}_2 \mathrm{O}_7^{2-}+2 \mathrm{H}^{+}+3 \mathrm{SO}_2 \longrightarrow 2 \mathrm{Cr}^{3+} \text { (green) }+B+\mathrm{H}_2 \mathrm{O} .}\)
1. SO42-
2. OH-
3. \(SO_3^{-2}\)
4. None of the above
Subtopic: Detection of Anions |
80%
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What is the color change observed when sulphur dioxide reacts with acidified potassium dichromate solution?
1. Red to green
2. Green to red
3. Orange to green
4. Yellow to green
1. Red to green
2. Green to red
3. Orange to green
4. Yellow to green
Subtopic: Detection of Anions |
79%
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