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Given the molecular formula of the hexa-coordinated complexes (A) CoCl3.6NH3 (B) CoCl3.5NH3   (C) CoCl3.4NH3. If the number of coordinated NH3 molecules in A, B and C respectively are 6, 5 and 4 the primary valency in (A), (B) and (C) are:
  • a)
    6, 5, 4                             
  • b)
    3, 3, 3
  • c)
    0, 1, 2                          
  • d)
    3, 2, 1                    
Correct answer is option 'D'. Can you explain this answer?
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Given the molecular formula of the hexa-coordinated complexes (A) CoCl...
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Given the molecular formula of the hexa-coordinated complexes (A) CoCl...
Explanation:
To determine the primary valency in the given complexes, we need to understand the concept of primary and secondary valencies in coordination complexes.

Primary Valency:
The primary valency refers to the oxidation state or the oxidation number of the central metal ion in a coordination complex. It is determined by the charge on the complex ion or the number of negative charges that the metal ion must balance.

Secondary Valency:
The secondary valency refers to the number of ligands attached to the central metal ion. It represents the coordination number of the metal ion.

Now, let's analyze each complex and determine their primary valencies.

A) CoCl3.6NH3:
In this complex, there are 6 NH3 ligands coordinated to the central Co(III) ion. The Cl ligands are not involved in coordination. Since the complex is neutral, the oxidation state of Co must balance the charges of the NH3 ligands. Each NH3 ligand has a neutral charge, so the oxidation state of Co is +3. Therefore, the primary valency of A is 3.

B) CoCl3.5NH3:
In this complex, there are 5 NH3 ligands coordinated to the central Co(III) ion. The Cl ligands are not involved in coordination. Since the complex is neutral, the oxidation state of Co must balance the charges of the NH3 ligands. Each NH3 ligand has a neutral charge, so the oxidation state of Co is +3. Therefore, the primary valency of B is also 3.

C) CoCl3.4NH3:
In this complex, there are 4 NH3 ligands coordinated to the central Co(III) ion. The Cl ligands are not involved in coordination. Since the complex is neutral, the oxidation state of Co must balance the charges of the NH3 ligands. Each NH3 ligand has a neutral charge, so the oxidation state of Co is +3. Therefore, the primary valency of C is 3.

Conclusion:
Based on the analysis, the primary valency in complexes A, B, and C is 3 in each case. Therefore, the correct answer is option D) 3, 2, 1.
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Given the molecular formula of the hexa-coordinated complexes (A) CoCl3.6NH3 (B) CoCl3.5NH3 (C) CoCl3.4NH3. If the number of coordinated NH3 molecules in A, B and C respectively are 6, 5 and 4 the primary valency in (A), (B) and (C) are:a)6, 5, 4b)3, 3, 3c)0, 1, 2d)3, 2, 1Correct answer is option 'D'. Can you explain this answer?
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Given the molecular formula of the hexa-coordinated complexes (A) CoCl3.6NH3 (B) CoCl3.5NH3 (C) CoCl3.4NH3. If the number of coordinated NH3 molecules in A, B and C respectively are 6, 5 and 4 the primary valency in (A), (B) and (C) are:a)6, 5, 4b)3, 3, 3c)0, 1, 2d)3, 2, 1Correct answer is option 'D'. Can you explain this answer? for Chemistry 2024 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about Given the molecular formula of the hexa-coordinated complexes (A) CoCl3.6NH3 (B) CoCl3.5NH3 (C) CoCl3.4NH3. If the number of coordinated NH3 molecules in A, B and C respectively are 6, 5 and 4 the primary valency in (A), (B) and (C) are:a)6, 5, 4b)3, 3, 3c)0, 1, 2d)3, 2, 1Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Chemistry 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Given the molecular formula of the hexa-coordinated complexes (A) CoCl3.6NH3 (B) CoCl3.5NH3 (C) CoCl3.4NH3. If the number of coordinated NH3 molecules in A, B and C respectively are 6, 5 and 4 the primary valency in (A), (B) and (C) are:a)6, 5, 4b)3, 3, 3c)0, 1, 2d)3, 2, 1Correct answer is option 'D'. Can you explain this answer?.
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