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1 mol of CoCl₃·4NH₃ (green or violet) gives how many moles of AgCl?
A2
B1
C3
D0
Answer & Solution
Correct answer: B. 1
CoCl₃·4NH₃ = **[CoCl₂(NH₃)₄]Cl**, a 1:1 electrolyte. Only 1 Cl⁻ is outside the coord sphere → **1 mol AgCl**. The other 2 Cl⁻ are coordinated to Co. Green and violet are *cis*/*trans* geometrical isomers.
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