| Direction (15 - 19): A student of class XII studied the close packing of spheres, with vacant sites (or voids) known as holes. These are of two types i. e. tetrahedral and octahedral voids. A tetrahedral void is formed when four spheres placed at the corners of a tetrahedron touch each other. An octahedral void is created, when three spheres arranged in the corners of an equilateral triangle are placed over another similar set of three spheres pointing in the opposite direction. The actual size of these voids is linked to that of the spheres i.e. greater the size of the spheres, more will be the size of the voids. |
| In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices : |
| Assertion: Hexagonal close packing is more tight than cubic close packing. |
| Reason: Co-ordination number in both the cases is 12. |
A) Assertion and reason both are correct statements and reason is correct explanation for assertion.
B) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C) Assertion is correct statement but reason is wrong statement.
D) Assertion is wrong statement but reason is correct statement.
Correct Answer: D
Solution :
Correct assertion. Both hexagonal and cubic close packing are equally tight (occupied space = 74%).
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