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NCERT Class XII Chemistry
Chapter - Coordination Compounds
Questions with Solutions

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Question : 41
Total: 43
Predict the number of unpaired electrons in the square planer [Pt(CN)4]2– ion.
Solution:  
For square planer shape, the hybridisation is dsp‌2. Hence, theunpaired electrons in 5d orbital pair up to make one d-orbital empty fordsp‌2hybridisation. Thus there is no unpaired electron.
[Pt(CN)4]2–:Pt(78):6s15d9,
Pt2+:6s05d8
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