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Q. No.On treating a compound with warm dil. H2SO4, gas X is evolved which turns K2Cr2O7 paper acidified with dil. H2SO4 to a green compound Y. X and Y respectively are -
1.
2.
3.
4.
Subtopic: Chemistry of Mn and Cr Compounds |
JEE
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If dichromate ion is treated with base, the oxidation number of Cr in the product formed will be:
1. +6
2. +4
3. +5
4. +2
Subtopic: Chemistry of Mn and Cr Compounds |
75%
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The incorrect statement is:
| 1. | Manganate and permanganate ions are paramagnetic. |
| 2. | Manganate ion is green in color and permanganate ion is purple in color. |
| 3. | In manganate and permanganate ions, the -bonding, takes place by overlap of p-orbitals of oxygen and d-orbitals of manganese. |
| 4. | Manganate and permanganate ions are tetrahedral. |
Subtopic: Chemistry of Mn and Cr Compounds |
82%
From NCERT
JEE
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During the qualitative analysis of \(SO^{2-}_3\) using acidified \(H_2SO_4, \ SO_2\) gas evolved which turns \(K_2Cr_2O_7\) solution:
1. Green
2. Black
3. Blue
4. Red
1. Green
2. Black
3. Blue
4. Red
Subtopic: Chemistry of Mn and Cr Compounds |
78%
From NCERT
JEE
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When K2Cr2O7 is used in an acidic medium during titration, the oxidation number of Cr in the product side is-
1. +6
2. +2
3. +3
4. +4
1. +6
2. +2
3. +3
4. +4
Subtopic: Chemistry of Mn and Cr Compounds |
From NCERT
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How many \(M n=O\) (manganese-oxygen double bonds) bonds are present in the compound \(\mathrm{Mn}_2 \mathrm{O}_7\)?
1. 4
2. 5
3. 6
4. 3
1. 4
2. 5
3. 6
4. 3
Subtopic: Chemistry of Mn and Cr Compounds |
69%
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In a neutral or a faintly alkaline solution, \(\mathrm{ MnO^-_4}\) oxidises thiosulphate to :
1. \(\mathrm{S}_2 \mathrm{O}_7^{2-} \)
2. \(\mathrm{S}_2 \mathrm{O}_8^{2-} \)
3. \(\mathrm{SO}_3^{2-} \)
4. \(\mathrm{SO}_4^{2-}\)
1. \(\mathrm{S}_2 \mathrm{O}_7^{2-} \)
2. \(\mathrm{S}_2 \mathrm{O}_8^{2-} \)
3. \(\mathrm{SO}_3^{2-} \)
4. \(\mathrm{SO}_4^{2-}\)
Subtopic: Chemistry of Mn and Cr Compounds |
58%
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JEE
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Which of the following oxidation reactions are carried out by both \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) and \(\mathrm{KMnO}_4\) in acidic medium?
A. \(\mathrm{I}^{-} \rightarrow \mathrm{I}_2\)
B. \(\mathrm{S}^{2-} \rightarrow \mathrm{S}\)
C. \(\mathrm{Fe}^{2+} \rightarrow \mathrm{Fe}^{3+}\)
D. \(\mathrm{I}^{-} \rightarrow \mathrm{IO}_3^{-}\)
E. \(\mathrm{S}_2 \mathrm{O}_3^{2-} \rightarrow \mathrm{SO}_4^{2-}\)
Choose the correct answer from the options given below:
1. B, C and D only
2. A, D and E only
3. A, B and C only
4. C, D and E only
A. \(\mathrm{I}^{-} \rightarrow \mathrm{I}_2\)
B. \(\mathrm{S}^{2-} \rightarrow \mathrm{S}\)
C. \(\mathrm{Fe}^{2+} \rightarrow \mathrm{Fe}^{3+}\)
D. \(\mathrm{I}^{-} \rightarrow \mathrm{IO}_3^{-}\)
E. \(\mathrm{S}_2 \mathrm{O}_3^{2-} \rightarrow \mathrm{SO}_4^{2-}\)
Choose the correct answer from the options given below:
1. B, C and D only
2. A, D and E only
3. A, B and C only
4. C, D and E only
Subtopic: Chemistry of Mn and Cr Compounds |
69%
From NCERT
JEE
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