The largest oxidation number exhibited by an element depends on its electronic configuration. With which of the following electronic configurations will the element exhibit the largest oxidation number?

1. 3d14s2

2. 3d34s2

3. 3d54s1

4. 3d54s2

Subtopic:  d-Block Elements- Properties & Uses |
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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

Subtopic:  d-Block Elements- Properties & Uses |
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The electronic configuration of Cu(II) is 3d9 whereas that of Cu(I) is 3d10, the correct statement about the aqueous solution of  Cu(II) and Cu(I) among the following is:

1. Cu(II) is more stable
2. Cu(II) is less stable
3. Cu(I) and Cu(II) are equally stable
4. Stability of Cu(I) and Cu(II) depends on the nature of copper salts

Subtopic:  d-Block Elements- Properties & Uses |
 67%
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Metallic radii of some transition elements are given below. Which of these elements will have highest density?

Element

            Fe

         Co

           Ni

           Cu

Metallic radii/pm

           126    

        125

         125

            128

1.  Fe 

2.  Ni

3.  Co

4.  Cu

Subtopic:  d-Block Elements- Properties & Uses |
 72%
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The coloured compound among the following in the solid state is:
1. \( \mathrm{Ag}_{2} \mathrm{SO}_{4} \)
2. \(\mathrm {C u F}_{2} \)
3. \(\mathrm {Zn F}_{2} \)
4. \(\mathrm{Cu}_{2} \mathrm{Cl}_{2} \)

Subtopic:  d-Block Elements- Properties & Uses |
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On addition to a 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

2MnO2

3MnSO4

4Mn2O3


 

Subtopic:  Chemistry of Mn and Cr Compounds |
 62%
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The magnetic nature of elements depends on the presence of unpaired electrons. Identify the configuration of the transition element, which shows the highest magnetic moment.

1.  3d7
2.  3d5
3.  3d8
4.  3d2

Subtopic:  d-Block Elements- Properties & Uses |
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Which of the following oxidation state is common for all lanthanoids?

1.  +2

2.  +3

3.  +4

4.  +5

Subtopic:  f-Block Elements- Properties & Uses |
 92%
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Which of the following reactions are disproportionation reactions?

(i) Cu+    Cu2+ + Cu

(ii) 3MnO4- + 4H+         2MnO4- + MnO2 + 2H2O

(iii) 2KMnO4          K2MnO4 + MnO2 + O2

(iv) 2MnO4- + 3Mn2+ + 2H2O         5MnO2 + 4H+

1.  (i)

2.  (i) , (ii) and (iii)

3.  (ii) , (iii) and (iv)

4.  (i) and (iv)

Subtopic:  d-Block Elements- Properties & Uses |
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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

Subtopic:  Chemistry of Mn and Cr Compounds |
 66%
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