Question:

Total number of molecules/species from the following which will be paramagnetic is ________________________. O2,O2+,O2,NO,NO2,CO,K2[NiCl4],[Co(NH3)6]Cl3,K2[Ni(CN)4] O_2, O_2^+, O_2^-, NO, NO_2, CO, K_2[NiCl_4], [Co(NH_3)_6]Cl_3, K_2[Ni(CN)_4]

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Molecular orbital theory helps determine paramagnetic behavior based on unpaired electrons.
Updated On: Mar 17, 2025
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Correct Answer: 5

Solution and Explanation

A species is paramagnetic if it has unpaired electrons:
  • O2 O_2 (paramagnetic) ✅
  • O2+ O_2^+ (paramagnetic) ✅
  • O2 O_2^- (paramagnetic) ✅
  • NO NO (paramagnetic) ✅
  • NO2 NO_2 (paramagnetic) ✅
  • CO CO (diamagnetic) ❌
  • K2[NiCl4] K_2[NiCl_4] (paramagnetic) ✅
  • [Co(NH3)6]Cl3 [Co(NH_3)_6]Cl_3 (diamagnetic) ❌
  • K2[Ni(CN)4] K_2[Ni(CN)_4] (diamagnetic) ❌
Total paramagnetic species = 5.
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