TlAl \( \left(\mathrm{SO}_{4}\right)_{2} \cdot x \mathrm{H}_{2} \mathrm{O} \) is bcc with ' \( a...

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TlAl \( \left(\mathrm{SO}_{4}\right)_{2} \cdot x \mathrm{H}_{2} \mathrm{O} \) is bcc with ' \( a \) ' \( =1.22 \mathrm{~nm} \). If the density of the solid is \( 2.32 \mathrm{~g} / \mathrm{cc} \), then the value of \( x \) is (Given : \( N_{A}=6 \times 10^{23} \); at. mass : \( \mathrm{Tl}=204, \mathrm{Al}=27, \mathrm{~S}=32 \) ).
(a) 2
(b) 4
(c) 47
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