A complex PtCl_4 .5 NH_3 shows a molar conductance of 402 ohm^ -1 ~cm^2 ~mol^ -1 in water and precipitates three moles of AgCl with AgNO_3 solution. The formula of the complex is

Correct answer: C. [Pt(NH_3)_5 Cl] Cl_3 The complex PtCl_4 .5 NH_3 is designated as [Pt(NH_3)_5 Cl] Cl_3 which ionizes to [Pt(NH_3)_5 Cl]^ 3+ +3 Cl^ - ions. Thus total ions produced are four but three moles of AgCl are produced from 3 Cl^ - ions with AgNO_3 .

AIIMS 2010

Exam: AIIMS
Year: 2010
Subject: Chemistry
Chapter: Coordination Compounds

AIIMS 2010 · Chemistry · Coordination Compounds

A complex PtCl_4 .5 NH_3 shows a molar conductance of 402 ohm^ -1...

A complex

\mathrm{PtCl}_4 .5 \mathrm{NH}_3

shows a molar conductance of

402 \mathrm{ohm}^{-1} \mathrm{~cm}^2 \mathrm{~mol}^{-1}

in water and precipitates three moles of

\mathrm{AgCl}

with

\mathrm{AgNO}_3

solution. The formula of the complex is

Options

A $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Cl}_4$
B $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right] \mathrm{Cl}_2$
C $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \mathrm{Cl}_3$
D $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right] \mathrm{Cl}$

Correct answer

C. $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \mathrm{Cl}_3$

Step-by-step solution

The complex

\mathrm{PtCl}_4 .5 \mathrm{NH}_3

is designated as \left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \mathrm{Cl}_3

which ionizes to \left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right]^{3+} +3 \mathrm{Cl}^{-}

ions. Thus total ions produced are four but three moles of

\mathrm{AgCl}

are produced from

3 \mathrm{Cl}^{-}

ions with

\mathrm{AgNO}_3

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