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 Multiple Choice QuestionsMultiple Choice Questions

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11.

The catalytic activity of transition metals and their compounds is ascribed mainly to

  • their magnetic behaviour

  • their unfilled d- orbitals

  • their ability to adopt variable oxidation states

  • their ability to adopt variable oxidation states

612 Views

12.

Which of the following exhibits only +3 oxidation states?

  • U

  • Th

  • Ac

  • Ac

535 Views

13.

For the four successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order?

(At. no. Cr = 24, Mn = 25, Fe = 26, Co = 27)

  • Fe > Mn > Co> Cr 

  • Co > Mn > Fe > Cr

  • Cr > Mn > Co > Fe

  • Cr > Mn > Co > Fe

1180 Views

14.

Acidified K2Cr2O7 solution turns green when Na2SO3 is added to it. This is due to the formation of 

  • CrO42-

  • Cr2(SO3)3

  • CrSO4

  • CrSO4

724 Views

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15.

Gadolinium belongs to 4f series. Its atomic number is 64. which of the following is the correct electronic configuration of gadolinium?

  • [Xe]4f8 6d2

  • [Xe]4f95s1

  • [Xe]4f7 5d16s2

  • [Xe]4f7 5d16s2

743 Views

16.

Assuming complete ionisation, same moles of which of the following compounds will require the least amount of acidified KMnO4 for complete oxidation?

  • FeSO4

  • FeSO3

  • FeC2O4

  • FeC2O4

2500 Views

17.

Which of the statements given below is incorrect?

  • Cl2O7 is an anhydride of perchloric acid

  • O3molecule is bent

  • ONF is isoelectronic with NO2

  • ONF is isoelectronic with NO2

1054 Views

18.

Which one of the following compounds is a peroxide? 

  • KO2

  • BaO2

  • MnO2

  • MnO2

537 Views

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19.

Which of the following ions will exhibit colour in aqueous solutions?

  • La3+ (Z = 57)

  • Ti3+ (Z = 22)

  • Lu3+

  • Lu3+

617 Views

20.

Which of the following oxidation states is the most common among the lanthanoids

  • 4

  • 2

  • 5

  • 5

330 Views

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