Question:
In complex CrCl\(_3\cdot 6H_2O\), the correct primary valency, secondary valency, and coordination number are respectively x, y, and z. What are x, y, and z?
In complex CrCl\(_3\cdot 6H_2O\), the correct primary valency, secondary valency, and coordination number are respectively x, y, and z. What are x, y, and z?
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Primary valency = oxidation state; secondary valency = coordination number in coordination compounds.
Updated On: Jul 18, 2026
- x = 6, y = 3, z = 6
- x = 3, y = 6, z = 6
- x = 3, y = 6, z = 4
- x = 3, y = 6, z = 4
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The Correct Option is B
Solution and Explanation
Step 1: Understand primary and secondary valency.
Primary valency corresponds to oxidation state of metal, while secondary valency corresponds to coordination number (number of ligands directly attached to metal).
Step 2: Determine oxidation state of Cr.
In CrCl\(_3\cdot 6H_2O\), chromium is in +3 oxidation state because 3 chloride ions balance it: \[ \text{Primary valency} = 3 \]
Step 3: Identify coordination sphere.
6 water molecules act as ligands in coordination sphere, so total ligands attached to Cr = 6.
Step 4: Determine secondary valency.
Secondary valency = number of ligands directly attached = 6.
Step 5: Determine coordination number.
Coordination number = 6 (octahedral complex).
Step 6: Final conclusion.
\[ x = 3,\quad y = 6,\quad z = 6 \] \[ \boxed{(3,6,6)} \]
Primary valency corresponds to oxidation state of metal, while secondary valency corresponds to coordination number (number of ligands directly attached to metal).
Step 2: Determine oxidation state of Cr.
In CrCl\(_3\cdot 6H_2O\), chromium is in +3 oxidation state because 3 chloride ions balance it: \[ \text{Primary valency} = 3 \]
Step 3: Identify coordination sphere.
6 water molecules act as ligands in coordination sphere, so total ligands attached to Cr = 6.
Step 4: Determine secondary valency.
Secondary valency = number of ligands directly attached = 6.
Step 5: Determine coordination number.
Coordination number = 6 (octahedral complex).
Step 6: Final conclusion.
\[ x = 3,\quad y = 6,\quad z = 6 \] \[ \boxed{(3,6,6)} \]
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