Question

In the coordination compound [Pt(en)₂Cl₂]Cl₂, the complex ion is ______

		Pt(en)2Cl2 2+
		Pt 4+
		Cl-
		en
		Pt(en)2Cl2 2-

Answer 1

According to the nomenclature of coordination compounds the atoms/molecules written outside the square brackets are ionisable that is when they are dissolved in water the species outside the square brackets will break into ions. On the other hand entities inside the square brackets are non ionisable.

So when the given complex is dissolved 2 Cl will ionise to give choride anion and the remaining species will be called complex ion and it will have +2 charge on it.

[Pt(en)₂Cl₂]Cl₂   ----------->   [Pt(en)₂Cl₂]²⁺ + 2 Cl^-

So correct answer is [Pt(en)₂Cl₂]²⁺

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