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

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181.

Transition metal ions show colour because

  • they absorb light

  • They emit light

  • They are paramagentic

  • they exhibit d-d transition


182.

Transitional metal ions have an ability of complex formation. They have this tendency due to

  • catalytic property

  • high enthalpy of atomisation

  • high nuclear charge

  • All of the above


183.

In the reduction of KMnO4 by warm acidified oxalic acid, the oxidation number of Mn changes from

  • +4 to +2

  • +6 to +4

  • +7 to +2

  • +7 to +4


184.

Transition metals have the electronic configuration (n -1)d1-10ns1-2. The d-orbitals are degenerate. Colour of transition metal ions is due to absorption of some wavelength. This result is

  • d-s transition

  • s-d transition

  • s-s transition

  • d-d transition


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185.

Manganese salt + PbO2 + conc. HNO3 → the solution acquires purple colour. The colour is due to

  • Mn(NO3)2

  • Pb(NO3)2

  • HMnO4

  • MnO


186.

Acidified solution of chromic acid on treatment with H2O2 yields

  • CrO3 + H2O + O2

  • Cr2O3 + H2O + O2

  • CrO5 + H2O

  • H2Cr2O7 + H2O + O2


187.

German silver contains which following metals?

  • Cu, Zn

  • Fe, Zn

  • Zn, Fe, Ni

  • Cu, Zn, Ni


188.

Which one of the following lanthanide ions does not exhibit paramagnetism?

  • Lu3+

  • Ce3+

  • Eu3+

  • Yb3+


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189.

What is the change in the oxidation state of Mn in the reaction of MnO4- with H2O4 in acidic medium?

  • 7 ➔4

  • 6➔4

  • 7➔2

  • 6➔2


190.

The following reaction occurs in acidic medium KMnO4 + 8H+ + 5e- → K+ + Mn2+ + 4H2O. What is the equivalent weight of KMnO4 ?

(Molecular weight of KMnO4 = 158)

  • 79.0

  • 31.6

  • 158.0

  • 39.5


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