Q.

Assertion: 2-D hexagonal close packing is more efficient than the 2-D square close packing

Reason: More free space in between the metallic spheres in 2-D hexagonal close packing than the square close packing

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a

Both A and R are false

b

A and R are true and ‘R’ explains ‘A’

c

‘A’ is true ‘R’ is false

d

A and R are true and ‘R’ not explains ‘A’

answer is C.

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Detailed Solution

  • Hexagon is  obtain by joining the centres of these six constituent particles.
  •  Therefore this type of packing is known as hexagonal closed packing in 2-D. Hexagonal closed packing is more efficient than square packing as it has lesser free space.
  •  The percentage of space occupied is more
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