KEAM Werner Theory — practice questions

Explore 2 free Werner Theory questions in KEAM Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Werner Theory questions and exercises with answers

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**Werner's primary valency** of a metal in a coordination compound is satisfied by:Read the answer and worked solution →How many ions are produced per formula unit when $[Cr(NH_3)_6]Cl_3$ is dissolved in water?Read the answer and worked solution →

Worked practice questions

Werner's primary valency of a metal in a coordination compound is satisfied by:

Neutral ligands only
Anions (ionizable, outside the coordination sphere)
The metal itself
Cations

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Correct answer: B. Anions (ionizable, outside the coordination sphere)

Werner postulated that metals have two valencies: **primary** (ionizable) = oxidation state, satisfied by anions outside the sphere. **secondary** (non-ionizable) = coordination number, satisfied by ligands inside the sphere.

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How many ions are produced per formula unit when $[Cr(NH_3)_6]Cl_3$ is dissolved in water?

1
2
4 (one $[Cr(NH_3)_6]^{3+}$ + three $Cl^-$)
7

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Correct answer: C. 4 (one $[Cr(NH_3)_6]^{3+}$ + three $Cl^-$)

**Ionisation:** $[Cr(NH_3)_6]Cl_3 \to [Cr(NH_3)_6]^{3+} + 3Cl^-$. Total **4 ions**. Conductance measurements gave Werner his clue to distinguish coordination spheres.