Q52. Number of molecules/species from the following having one unpaired electron is $\mathrm { O } _ { 2 } , \mathrm { O } _ { 2 } ^ { - 1 } , \mathrm { NO } , \mathrm { CN } ^ { - 1 } , \mathrm { O } _ { 2 } ^ { 2 - }$
Q52. Number of molecules/species from the following having one unpaired electron is $\mathrm { O } _ { 2 } , \mathrm { O } _ { 2 } ^ { - 1 } , \mathrm { NO } , \mathrm { CN } ^ { - 1 } , \mathrm { O } _ { 2 } ^ { 2 - }$