Q.1 Which of the following primary and secondary valencies are not correctly marked against the compound?
1)[Cu(NH3)2]SO,, p =4, s= 4
2)
[Pt(NH3)2Cl2], p = 2. s = 4
3)
K2[PtCl.), p = 2, s = 4
4)
[Cr(NH3).]Cl2, p = 3, S = 6
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Among the given options, option 2 is incorrectly marked.
Primary valency refers to number of ions bonded with the complex. Secondary valency refers to cordination number or number of ligands attached to central element.
In the complex, [Pt(NH3)2Cl2], Platinum is the central element. It has attached two ammonia and two chloride ligands. Thus it's secondary valency is four.
As no ions are attached with the complex, hence primary valency of the complex is zero.
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