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Which of the following is not a double salt but is a complex salt-
P
(1) \( \mathrm{KCl} . \mathrm{MgCl}_{2}, 6 \mathrm{H}_{2} \mathrm{O} \)
W)
(2) \( \mathrm{FeSO}_{4} \cdot\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4} \cdot 6 \mathrm{H}_{2} \mathrm{O} \)
(3) \( \mathrm{K}_{2} \mathrm{SO}_{4} \cdot \mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3} \cdot 24 \mathrm{H}_{2} \mathrm{O} \)
(4) \( 4 \mathrm{KCN} . \mathrm{Fe}(\mathrm{CN})_{2} \)
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