Q. No.MnO2 when fused with KOH and oxidized in air gives a dark green compound X. In acidic solution, X undergoes disproportionation to give an intense purple compound Y and MnO2. The compounds X and Y, respectively are
1. K2MnO4 and KMnO4
2. Mn2O7 and KMnO4
3. K2MnO4 and Mn2O7
4. KMnO4 and K2MnO4
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The number of moles of Br2 produced when two moles of potassium permanganate are treated with excess potassium bromide in aqueous acidic medium is
1. 1
2. 3
3. 2
4. 5
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The number of moles of KMnO4 required to oxidize one equivalent of KI in the presence of sulfuric acid is
1. 5
2. 2
3. 1/2
4. 1/5
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Lanthanide contraction is caused due to
1. The appreciable shielding on outer electrons by 4f electrons from the nuclear charge
2. The appreciable shielding on outer electrons by 5d electrons from the nuclear charge
3. The same effective nuclear charge from Ce to Lu
4. The imperfect shielding on outer electrons by 4f electrons from the nuclear charge
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Europium (Eu) and Terbium (Tb) attain stable 4f configuration by exhibiting oxidation states of
1. +2 and +4
2. +3 and +4
3. +2 and +3
4. +1 and +3
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Four statements for Cr and Mn are given below:
| (I) | Cr2+ and Mn3+ have the same electronic configuration. |
| (II) | Cr2+ is a reducing agent while Mn3+ is an oxidizing agent. |
| (III) | Cr2+ is an oxidizing agent while Mn3+ is a reducing agent. |
| (IV) | Both Cr and Mn are oxidizing agents. |
The correct statements are
1. (I), (III),(IV)
2. (I) , (II)
3. (I), (II) and (IV)
4. (I), (IV)
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Silver nitrate solution when added to a colourless aqueous solution E forms a white precipitate which dissolves in excess of E. If the white precipitate is heated with water, it turns black and the supernatant solution gives a white precipitate with acidified barium nitrate solution. Therefore, E is
1. Na2S
2. Na2S2O3
3. Na2SO3
4. Na2SO4
Cyanide ion is a very good complexing agent and also functions as a reducing agent. Hence may cyanide complexes of metals are known. Addition of an aqueous solution of KCN to a solution of copper sulphate yields a white precipitate which is soluble in excess of aqueous KCN to form the complex
1. [Cu(CN)4]1-
2. [Cu(CN)4]2-
3. [Cu(CN)4]3-
4. [Cu(CN)4]4-
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