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Question
The radius of silver atom is 143.5 pm and it crystallises in face centred cubic arrangement. (Atomic mass of Ag = 107.47, NA = 6.023 × 1023)
What is the edge length of the unit cell?
Options
405.8 pm
40.6 pm
331.4 pm
287 pm
MCQ
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Solution
405.8 pm
Explanation:
Given: Radius of silver atom (r) = 143.5 pm
Face-centred cubic (fcc) Structure,
`a = (4 r)/sqrt 2`
∴ `a = (4 xx 143.5)/sqrt 2`
= `574/1.414`
= 405.8 pm
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Chapter 1: Solid State - QUESTIONS FROM ISC EXAMINATION PAPERS [Page 57]
