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Subject - Chemistry:

Basics

MCQ - 65-2251

Question:

Platinum (IV) chloride combines with ammonia to form compounds in which the co-ordination number of platinum is 6. A formula unit of one of the compounds contains a cation and only two chloride ion. What is the formula of this compound?

  1. Pt(NH3)6Cl4
  2. Pt(NH3)5Cl4
  3. Pt(NH3)4Cl4
  4. Pt(NH3)5Cl4

Correct Answer: C

Explanation:

The compound with coordination number 6 may be looked upon as [Pt(NH3)6-x Clx]2(Cl-)2 . Since Pt is in oxidation state IV, its chloride has a formula PtCl4, i.e. 4Cl atoms. Hence, x=2

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