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  • Help me solve this - p- d- and f-block elements - BITSAT-4

Which one is the most likely structure of CrCl_{3}.6H_{2}O is \frac{1}{3} of total chlorine of the compound is precipitated by adding AgNO_{3} to its aqueous solution:

  • Option 1)

    Cr\:\: Cl_{3}.6H_{2}O

  • Option 2)

    \left [ Cr(H_{2}O)_{3} \right Cl_{3}]

  • Option 3)

    \left [ Cr\:\:Cl_{2} \right (H_{2}O)_{4} ].Cl

  • Option 4)

    \left [ Cr (H_{2}O)_{5} \right ]Cl_{2}

 

Answers (1)

best_answer

As learnt in Concept @17487

Coordination Sphere -

The central atom/ion and the ligands attached to metal are enclosed in square bracket and this collectively termed as coordination sphere

- wherein

eg:

K_{4}\left [ Fe\left ( CN \right )_{6} \right ]

 K^{+} \rightarrow Counter ion

\left [ Fe\left ( CN \right )_{6} \right ]^{4-} \rightarrow  Coordination sphere

 

 

 If \frac{1}{3} of the Chlorine in the compound precipitates, that means \frac{2}{3} of the chlorine must be in the Co-ordination sphere. 

Therefore Structure is \left [ Cr\left ( H_{2}O \right )_{4} Cl_{2} \right ]Cl

 


Option 1)

Cr\:\: Cl_{3}.6H_{2}O

This option is incorrect

Option 2)

\left [ Cr(H_{2}O)_{3} \right Cl_{3}]

This option is incorrect

Option 3)

\left [ Cr\:\:Cl_{2} \right (H_{2}O)_{4} ].Cl

This option is correct

Option 4)

\left [ Cr (H_{2}O)_{5} \right ]Cl_{2}

This option is incorrect

Posted by

prateek

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