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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, 2, 1
  • c)
    0, 1, 2
  • d)
    3, 3, 3
Correct answer is option 'B'. Can you explain this answer?
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Given the molecular formula of the hexa coordinated complexes (A) CoCl...
The primary valencies in (i) CoCl3.6NH3, (ii) CoCl3.5NH3, (iii) CoCl3.4NH3. If the number of co-ordinated NH3 molecules in i, ii and iii respectively are 6, 5, 4,(i), (ii) and (iii) are 3, 2 and 1 respectively.
(i) CoCl3.6NH3 in this complex Co is co-ordinated with six NH3 molecules, which means the primary valency of Co is 3. complex is [Co(NH3)6]Cl3
(ii) CoCl3.5NH3 in this complex Co is co-ordinated with five NH3 molecules, which means the primary valency of Co is 2.complex is [Co(NH3)5]Cl2
(iii) CoCl3.4NH3 in this complex Co is co-ordinated with four NH3 molecules, which means the primary valency of Co is 1.complex is [Co(NH3)4]Cl
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Given the molecular formula of the hexa coordinated complexes (A) CoCl...
Primary Valency in Coordinated Complexes

Definition: Primary valency is the total number of atoms or groups that can bind directly with the central metal ion. It is also known as oxidation number or charge on the central metal ion.

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 given as follows:

- In complex A, the number of coordinated NH3 molecules is 6. Therefore, the primary valency is 6.
- In complex B, the number of coordinated NH3 molecules is 5. Therefore, the primary valency is 2 because the oxidation number of Co is +3 and the total charge on the ligands is -3. Thus, the primary valency is equal to the oxidation number of the central metal ion.
- In complex C, the number of coordinated NH3 molecules is 4. Therefore, the primary valency is 1 because the oxidation number of Co is +3 and the total charge on the ligands is -2. Thus, the primary valency is equal to the oxidation number of the central metal ion.

Hence, the correct answer is option 'B' which says that the primary valency in (A), (B) and (C) are 3, 2, and 1 respectively.
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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, 2, 1c)0, 1, 2d)3, 3, 3Correct answer is option 'B'. 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, 2, 1c)0, 1, 2d)3, 3, 3Correct answer is option 'B'. 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, 2, 1c)0, 1, 2d)3, 3, 3Correct answer is option 'B'. 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, 2, 1c)0, 1, 2d)3, 3, 3Correct answer is option 'B'. Can you explain this answer?.
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