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AIIMS UG The d- and f-Block Elements — practice questions

Explore 8 free The d- and f-Block Elements questions in AIIMS UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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The d- and f-Block Elements questions and exercises with answers

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Ethylenediamine (en) is best described as a:Read the answer and worked solution →The biological molecule HAEMOGLOBIN contains which metal at its centre?Read the answer and worked solution →A COORDINATION COMPOUND consists of a central metal atom (or ion) BONDED to a set of surrounding molecules or ions, calledRead the answer and worked solution →The COORDINATION NUMBER of the central metal in a complex isRead the answer and worked solution →A ligand that has ONLY ONE donor atom (which forms a single bond to the central metal) is calledRead the answer and worked solution →Cis-trans isomerism is observed inRead the answer and worked solution →Coordination compounds of transition metals are often COLOURED. CFT explains this colour as arising fromRead the answer and worked solution →$[\mathrm{Ni(CO)_4}]$ is tetrahedral and diamagnetic. The oxidation state of nickel in this complex isRead the answer and worked solution →

Worked practice questions

Ethylenediamine (en) is best described as a:

  1. Monodentate ligand, with one donor atom per molecule
  2. Bidentate ligand, with two N donor atoms per molecule
  3. Tridentate ligand, with three donor atoms in chelation
  4. Hexadentate ligand, with six donor atoms like EDTA
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Correct answer: B. Bidentate ligand, with two N donor atoms per molecule

Ethylenediamine has two nitrogen donor atoms; bidentate.

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The biological molecule HAEMOGLOBIN contains which metal at its centre?

  1. Copper (Cu) ion at the centre
  2. Magnesium (Mg) ion at the centre
  3. Iron (Fe) in a porphyrin ring
  4. Cobalt (Co) at the centre
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Correct answer: C. Iron (Fe) in a porphyrin ring

**Haemoglobin:** iron-porphyrin (haem) complex, carries O2 in vertebrate blood. **CHLOROPHYLL:** Mg-porphyrin (plant photosynthesis). **VITAMIN B12:** cobalt-corrin. Three iconic biological coordination compounds.

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A COORDINATION COMPOUND consists of a central metal atom (or ion) BONDED to a set of surrounding molecules or ions, called

  1. ligands
  2. isotopes
  3. buffer pairs
  4. co-monomers
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Correct answer: A. ligands

1. syllabus introduces the vocabulary of coordination chemistry. 2. A coordination compound has a CENTRAL metal atom or ion (typically a transition metal) bonded to a definite number of ANCILLARY species via dative (coordinate covalent) bonds. 3. The ancillary species are called LIGANDS — neutral molecules (NH$_3$, H$_2$O, CO) or anions (Cl$^-$, OH$^-$, CN$^-$) that donate a lone pair to the metal. 4. Other options are unrelated: isotopes (B) refer to nuclear identity; buffer pairs (C) to pH chemistry; co-monomers (D) to polymerisation. _Source: syllabus Chemistry Part 1, Ch 5 "Coordination Compounds", §5.1 (Werner's Theory and basic terms), p. 1–2._

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More Chemistry topics

Coordination Compoundsd- and f-Block Elements