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MHT-CET Transition and Inner Transition Elements — practice questions — page 3

Explore 68 free Transition and Inner Transition Elements questions in MHT-CET Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Transition and Inner Transition Elements questions and exercises with answers

Showing questions 61–68 of 68.

Along the lanthanoids from La(OH)3 to Lu(OH)3, basicity of hydroxidesRead the answer and worked solution →The general outer configuration of lanthanoids isRead the answer and worked solution →La is [Xe] 6s2 5d1 and not 6s2 4f1 becauseRead the answer and worked solution →Colours of lanthanoid ions arise fromRead the answer and worked solution →Lanthanoid compounds are used to coat the inside ofRead the answer and worked solution →Which two actinoid isotopes are long-lived enough to occur in rocks?Read the answer and worked solution →Uranium in the +6 state corresponds to the configurationRead the answer and worked solution →Most actinoids areRead the answer and worked solution →

Worked practice questions

Along the lanthanoids from La(OH)3 to Lu(OH)3, basicity of hydroxides

  1. increases steadily
  2. decreases steadily
  3. stays constant
  4. vanishes at once
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Correct answer: B. decreases steadily

Ionic size falls from La3+ to Lu3+, so the hydroxides become less basic, with La(OH)3 the strongest base.

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The general outer configuration of lanthanoids is

  1. [Xe] 4f0-14 5d0-2 6s2
  2. [Ar] 3d1-10 4s2
  3. [Rn] 5f0-14 6d0-2 7s2
  4. [Kr] 4d1-10 5s2
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Correct answer: A. [Xe] 4f0-14 5d0-2 6s2

Lanthanoids fill 4f after the xenon core, with two electrons in 6s.

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La is [Xe] 6s2 5d1 and not 6s2 4f1 because

  1. 5d is slightly lower than 4f
  2. 6s is empty in lanthanum
  3. 4f orbitals do not exist
  4. La has no valence electrons
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Correct answer: A. 5d is slightly lower than 4f

For lanthanum the 4f level lies slightly above 5d, so the extra electron enters 5d.

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