(A) Graphite is soft while diamond is hard. (R) Graphite has three dimensional structure while diamond has planar.A. If both (A) and (R) are correct, and (R) is the correct explanation of (A).B. If both (A) and (R) are correct but (R) is not the correct explanation of (A).C. If (A) is correct but (R) is incorrect.D. If (A) is incorrect but (R) is correct.

(A) Graphite is soft while diamond is hard. (R) Graphite has three dim

1.	(A) Graphite is soft while diamond is hard. (R) Graphite has three dimensional structure while diamond has planar.A. If both (A) and (R) are correct, and (R) is the correct explanation of (A).B. If both (A) and (R) are correct but (R) is not the correct explanation of (A).C. If (A) is correct but (R) is incorrect.D. If (A) is incorrect but (R) is correct.
Answer» Correct Answer - C

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Packing refers to the arrangement of constituent units in such a way that the forces of attraction among the constituent particles is maximum and the constituents occupy the maximum available space. In two -dimensions ,there are square close packing and hexagonal close packing .In three- dimensions ,however, there are hexagonal close packing, cubic close packing and body-centered cubic packing. (i) hcp: AB AB AB AB ..... arrangement `" "`coordination no. = 12 `" "` % occupied space = 74 (ii) ccp: ABC ABC.... arrangement lt brgt `" "` coordination no. = 12 `" "`% occupied space = 74 bcc: 68% space is occupied `" "`coordination no.= 8 The empty space laft in three -dimensions is :A. `26%`B. `74%`C. `52.4%`D. `80%`

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