if the edge length of a NaH unit cell is...

if the edge length of a NaH unit cell is 488 pm, what is the length of Na-H bond if it crystallises in the fcc structure ?

A

122 pm

B

244 pm

C

488 pm

D

976 pm

Text Solution

Verified by Experts

The correct Answer is:

B

NaH has fcc structure similar to that of NaCl. Thus, edge length of NaH=`2(r_(Na^+)+(r_H^(-))` i.e., `2(r_(Na^+)+r_(H^-))`=488 pm
`therefore r_(Na^+)+r_(H^-)`=244 pm, which is Na-H bond length

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