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 Multiple Choice QuestionsMultiple Choice Questions

1.

When copper is heated with conc. HNO3 it produces

  • Cu(NO3)2 and NO

  • Cu(NO3)2, NO and NO2

  • Cu(NO3)2 and N2O

  • Cu(NO3)2 and N2O

1438 Views

2.

Which one of the following statements is correct when SO2 is passed through acidified K2Cr2O7 solution?

  • The solution is decolourized

  • SO2 is reduced

  • Green Cr2(SO4)3 is formed

  • The solution turns blue


3.

Because of lanthanoid contraction, of elements which of the following elements have nearly same atomic radii ? (Number in the parenthesis are atomic number).

  • Ti (22) and Zr(40)

  • Zr(40) and Nb (41)

  • Zr (40) and Hf (72)

  • Zr (40) and Hf (72)

716 Views

4.

In acidic medium,H2O2 changes Cr2O72- to CrO5 which has two (-O-O-) bonds. Oxidation state of Cr in CrO3 is 

  • +5

  • +3

  • +6

  • +6

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5.

Reason of lanthanoid contraction is

  • negligible Screening effect of 'f' orbitals

  • increasing the nuclear charge

  • decreasing the nuclear charge

  • decreasing the nuclear charge

539 Views

6.

Which of the following does not give oxygen on heating?

  • KClO3

  • Zn(ClO3)2

  • K2Cr2O7

  • K2Cr2O7

915 Views

7.

Which of the following lanthanoid ions is diamagnetic?
(At. number; Ce =58, Sm =62, Eu =63, Yb = 70)

  • Ce2+

  • Sm2+

  • Eu2+

  • Eu2+

2141 Views

8.

KMnO4 can be prepared from K2MnO4 as per reaction
3 MnO subscript 4 superscript 2 minus end superscript space plus 2 straight H subscript 2 straight O space rightwards harpoon over leftwards harpoon 2 MnO subscript 4 superscript minus space plus MnO subscript 2 space plus 4 OH to the power of minus
The reaction can go to completion by removing OH- ions by adding

  • HCl

  • KOH

  • CO2

  • CO2

3162 Views

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9.

Which one of the following does not correctly represent the correct order of the property indicated aginst it? 

  • Ti < V<Cr< Mn: increasing number of oxidation states

  • Ti< V<Cr3+<Mn3+ : increasing magnetic moment

  • Ti < V < Cr < Mn : Increasing melting points

  • Ti < V < Cr < Mn : Increasing melting points

481 Views

10.

Four successive members of the first series of the transition metals are listed below. For which one of them, the standard potential valueleft parenthesis straight E subscript straight M to the power of 2 plus end exponent divided by straight M end subscript superscript straight o right parenthesis has a positive sign?

  • Co (Z=27)

  • Ni (Z=28)

  • Cu (Z=29)

  • Cu (Z=29)

569 Views

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