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Which one is the most likely structure of \( \mathrm{CrCl}_{3} \cdot 6 \mathrm{H}_{2} \mathrm{O} \) if
P \( 1 / 3 \) of total chlorine of the compound is precipitated by

VV adding \( \mathrm{AgNO}_{3} \) to its aqueous solution:
(1) \( \mathrm{CrCl}_{3} \cdot 6 \mathrm{H}_{2} \mathrm{O} \)
(2) \( \left[\mathrm{CrCl}_{3}\left(\mathrm{H}_{2} \mathrm{O}\right)_{3}\right] \cdot\left(\mathrm{H}_{2} \mathrm{O}\right)_{3} \)
(3) \( \left[\mathrm{CrCl}_{2}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right] \cdot \mathrm{Cl} \cdot 2 \mathrm{H}_{2} \mathrm{O} \)
(4) \( \left[\mathrm{CrCl}\left(\mathrm{H}_{2} \mathrm{O}\right)_{5}\right] \mathrm{Cl}_{2} \cdot \mathrm{H}_{2} \mathrm{O} \)
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