MHT CET · Chemistry · Solid State
What is the type of hole occupied if limiting value of \(\frac{\mathrm{r}+}{\mathrm{r}-}\) is in the range of \(0.225\) to \(0.414 ?\)
- A Octahedral
- B Cubic
- C Planar triangular
- D Tetrahedral
Answer & Solution
Correct Answer
(D) Tetrahedral
Step-by-step Solution
Detailed explanation
The radius ratio is the ratio of the radius (r) of the atom or ion which can exactly fit in the octahedral void formed by spheres of radius \(R\). For trigonal voids, the radius ratio is \(0.155\).
For tetrahedral voids, the radius ratio is \(0.225\).
For octahedral voids, the radius ratio is \(0.414\).
For cubic voids, the radius ratio is \(0.732\).
Thus, the limiting radius ratio for tetrahedral structure is \(0.225-0.414\).
For tetrahedral voids, the radius ratio is \(0.225\).
For octahedral voids, the radius ratio is \(0.414\).
For cubic voids, the radius ratio is \(0.732\).
Thus, the limiting radius ratio for tetrahedral structure is \(0.225-0.414\).
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