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CBSE Class 12 Chemistry 2018 Solved Paper

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Question : 12
Total: 26
An element ' X ' (At. mass =40gmol−1 ) having f.c.c. structure, has unit cell edge length of 400‌pm. Calculate the density of ' X ' and the number of unit cells in 4gof′X′.(NA=6.022×1023mol−1)
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