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  • Confused! kindly explain, - Co-ordination Compounds - JEE Main-6

Given the molecular formula of the hexa coordinated complexes (A) CoCl_3\cdot 6NH_3 (B) CoCl_3\cdot 5NH_3(C) CoCl_3\cdot 4NH_3. If the number of co-ordinated NH_3 molecules in A, B and C respectively are 6, 5 and 4, the primary valency in (A), (B) and (C) are:

  • Option 1)

    6, 5, 4

  • Option 2)

      3, 2, 1

  • Option 3)

    0, 1, 2

  • Option 4)

     3, 3, 3

 

Answers (1)

best_answer

As we have learned

Primary valency -

These are normally ionisable and satisfied by negative ions.

 

- wherein

eg:

COCl_{2} \rightarrow  Primary Valency is 2

CrCl_{3}\rightarrow   Primary Valency is 3

 

 

The complexes can be written as follows

[Co(NH_{3})_6]Cl_3[Co(NH_3)_5Cl]Cl_2[Co(NH_3)_4Cl_4]Cl

Hence, number of primary valencies are 3, 2 and 1 respectively

 

 

 

 

 

 


Option 1)

6, 5, 4

Option 2)

  3, 2, 1

Option 3)

0, 1, 2

Option 4)

 3, 3, 3

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