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CUET · CHEMISTRY · PYQ PAPER 2025

A coordination compound \(CrCl _3 \cdot 4 H _2 O\) precipitates silver chloride when treated with silver nitrate. The molar conductance of its solution corresponds to a total of two ions.
What is the formula of the compound?

  1. A \(\left[ Cr \left( H _2 O \right)_4\right] Cl _3\)
  2. B \(\left[ CrCl _3\right] \backslash\) cdot \(4 H _2 O\)
  3. C \(\left[ Cr \left( H _2 O \right)_3 Cl _3\right] \backslash \operatorname{cdot} H _2 O\)
  4. D \(\left[ Cr \left( H _2 O \right)_4 Cl _2\right] Cl\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(\left[ Cr \left( H _2 O \right)_4 Cl _2\right] Cl\)

Step-by-step Solution

Detailed explanation

\(Molar\ conductance\ corresponds\ to\ 2\ ions\ \Rightarrow\ 1\ complex\ cation\ +\ 1\ Cl^-\). \(Precipitates\ AgCl\ \Rightarrow\ 1\ Cl^-\ is\ outside\ the\ coordination\ sphere\). \(Total\ Cl\ atoms\ are\ 3\ (from\ CrCl_3).\ Since\ 1\ Cl\ is\ outside,\ 2\ Cl\ are\ inside\).\)…
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