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A complex compound of cobalt has molecular formula containing five \( \mathrm{NH}_{3} \) molecules, one nitro
P group and two chlorine atom for one cobalt atom.

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One mole of this compound produces three moles of ion in aqueous solution. On reaction with excess of \( \mathrm{AgNO}_{3} \) solution two moles of \( \mathrm{AgCl} \) get precipitated. The Ionic formula of the compound.
(1) \( \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{NO}_{2} \mathrm{Cl}\right] \mathrm{NH}_{3} \mathrm{Cl} \)
(2) \( \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Cl}\right] \mathrm{ClNO}_{2} \)
(3) \( \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{NO}_{2}\right] \mathrm{Cl}_{2} \)
(4) \( \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5}\left(\mathrm{NO}_{2}\right) \mathrm{Cl}\right] \mathrm{Cl} \)
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