Important Questions of The d-And-f-Block Elements Chemistry | Zigya

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161.

In a transition series, with increase in atomic-number, the paramagnetism

  • increases gradually

  • decreases gradually

  • first increases to a maximum and then decreases

  • first decreases to a minimum and then increases


162.

Which of the following is a negatively charged bidentate ligand?

  • Cyano

  • Ethylene diamine

  • Acetato

  • Dimethyl glyoximato


163.

The electronic configuration of Cu2+ ion is

  • [Ar] 3d8 4s1

  • [Ar] 3d9 4s0

  • [Ar] 3d7 4s2

  • [Ar] 3d8 4s0


164.

Which one of the following shows highest magnetic moment?

  • Fe2+

  • Co2+

  • Cr3+

  • Ni2+


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165.

The correct statement is

  • The earlier members of lanthanoid series resemble calcium in their chemical properties.

  • The extent of actinoid contraction is almost the same as lanthanoid contraction.

  • In general, lanthanoid and actinoids do not show variable oxidation states.

  • Ce4+ in aqueous solution is not known.


166.

The electronic configuration of Gd2+ is (atomic number of Gd is 64).

  • [Xe]4f8

  • [Xe]4f7

  • [Xe]4f7 5d16s2

  • [Xe]4f7 5d1


167.

The composition of "copper matte" is

  • Cu2S + FeS

  • Cu2S + Cu2O

  • Cu2S + FeO

  • Cu2O + FeS


168.

The bivalent metal ion having maximum paramagnetic behaviour among the first transition series elements is

  • Mn2+

  • Cu2+

  • Sc2+

  • Cu+


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169.

When a brown compound of Mn (A) is treated with HCl, it gives a gas (B). The gas (B) taken in excess reacts with NH3 to give; an explosive compound (C). The compounds A, B and C respectively are

  • A - MnO2; B - Cl2; C - NCl3

  • A - MnO; B - Cl2; C - NH4Cl

  • A - Mn3O4; B - Cl2; C - NCl3

  • A - MnO3; B - Cl2; C - NCl2


170.

Mn2+ compounds are more stable than Fe2+ compounds towards oxidation to their +3 state, because

  • Mn2+ is more stable with high 3rd ionisation energy

  • Mn2+ is bigger in size

  • Mn2+ has completely filled d-orbital

  • Mn2+ does not exist


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