Assertion :In hexagonal close packing, voids are in between the three touching spheres whose centres lie at the corners of an equilateral triangle. Reason: In hexagonal close packing, voids are called square voids.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
In hexagonal close packing (hcp) and cubic close packing (ccp), each sphere of second layer touches with three spheres of first layer. Thus, they leave a small space in between which is known as tetrahedral site or interstices. The vacant space between four touching spheres is called as tetrahedral void. Since a sphere touches three spheres in the below layer and three spheres in the above layer, there are two tetrahedral sites associated with one sphere. It may by noted that a tetrahedral site does not mean that the site is tetrahedral in geometry but it means that this site is surrounded by four spheres and the centres of these four spheres lie at the apices of a regular tetrahedron.

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Similar questions

Q. Assertion: In hexagonal close packing, voids are between three touching spheres whose centres lie at the corners of an equilateral triangle.
Reason: In hexagonal close packing, voids are called square voids.

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct answer out of the following choices.

(a) Assertion and Reason both are correct statements and Reason is correct explanation for Assertion.

(b) Assertion and Reason both are correct satements but Reason is not correct explanation for Assertion.

(d) Assertion is wrong statement but Reason is correct statement.

Assertion (A) Total number of octahedral voids present in unit cell of cubic close packing including the one that is present at the body centre, is four.

Reason (R) Besides the body centre there is one octahedral void present at the centre of each of the six faces of the unit cell and each of which is shared between two adjacent unit cells.

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(1 + \frac{P b}{R T})

Reason: The compressibility factor for

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Q. Assertion : Two electrons of helium atom are placed in only one shell but three electrons of lithium need two shells.
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Reason (R) The coordination number is 12 in fcc structures.

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