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Resonance

IN CHROMIUM C...

Question

IN CHROMIUM CHLORIDE THE CHLORIDE IONS HAVE CCP ARRANGEMENT,AND CHROMIUM ARE PRESENT IN OCTAHEDRAL HLOES.WHAT FRACTION OF OCTAHEDRAL HOLES IS OCCUPIED?

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Solution

Formula of Chromium chloride is CrCl₃.
It is given that chloride ions have ccp arrangement, therefore, number of octahedral holes associated with one chloriode ion is 1 and number of tetrahedral holes associated with one chloride ion is 2.

Now, number of octahedral holes with 3 chloride ions = 3

Number of octahedral holes occupied by Cr³⁺ ion = 1

Therefore,

Fraction of octahedral holes occupied = 1/3

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