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Coordination Compounds — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryCoordination Compounds1 Mark
MCQ
According to Werner's theory of coordination compounds:
  • A
    Primary valency is ionisable.
  • B
    Secondary valency is ionisable.
  • C
    Primary and secondary valencies are ionisable.
  • D
    Neither primary nor secondary valency is ionisable.
✓

Answer

  1. Primary valency is ionisable.

Explanation:

Primary valency is ionisable according to Werner's theory of coordination compounds.

According to Werner's coordination theory, there are two kinds of valency, primary and secondary. The primary valency of a central metal ion is satisfied with anions.

For example, in [Cu(NH3​)4​]SO4​ primary valency is 2 and secondary valency is 4.

Secondary valence refers to coordination number. Since copper is coordinated to 4 ammonia ligands, secondary valence is 4. Primary valence is satisfied by anions. Since sulphate ion has −2 charge, primary valence is 2.

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