Statement -1:Distance between nearest neighbour in bcc is greater than that of fcc having same edge length. because Statenemt -2: fcc has greater packing than bcc.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.

Statement -1:Distance between nearest neighbour in bcc is greater than

1.	Statement -1:Distance between nearest neighbour in bcc is greater than that of fcc having same edge length. because Statenemt -2: fcc has greater packing than bcc.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 `" "` coordination no. = 12 `" "`% occupied space = 74 bcc: 68% space is occupied `" "`coordination no.= 8 The pattern of successive layers of ccp arrangement can be designated as:A. AB AB AB â€¦..B. AB ABC AB ABCâ€¦â€¦..C. ABC ABC ABC â€¦â€¦â€¦D. AB AB AB ABâ€¦â€¦â€¦
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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