Q. No.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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Electronic configuration of a transition element X in +3 oxidation state is [Ar]3d5 .What is its atomic number?
1. 25
2. 26
3. 27
4. 24
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The electronic configuration of Cu(II) is 3d9 whereas that of Cu(I) is 3d10. Which of the following is correct?
1. Cu(II) aq is more stable
2. Cu(II) aq is less stable
3. Cu(I) aq and Cu(II) aq are equally stable
4. Stability of Cu(I) aq and Cu(II) aq depends on nature of copper salts
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Generally transition elements form coloured salts due to the presence of unpaired electrons. Which of the following compounds will be coloured in solid state?
1. Ag2SO4
2. CuF2
3. ZnF2
4. Cu2Cl2
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On addition of small amount of KMnO4 to concentrated H2SO4, a green oily compound is obtained which is highly explosive in nature. Identify the compound from the following.
1. Mn2O7
2. MnO2
3. MnSO4
4. Mn2O3
The magnetic nature of elements depends on the presence of unpaired electrons. Identify the configuration of transition element, which shows highest magnetic moment.
1. 3d7
2. 3d5
3. 3d8
4. 3d2
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When KMnO4 solution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time because
1. CO2 is formed as the product.
2. Reaction is exothermic.
3. MnO4– catalyses the reaction.
4. Mn2+ acts as autocatalyst.
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