The correct options are a,b,c
- Dilute solution of Na in liquid ammonia is paramagnetic due to ammoniated e−1s
Na⊕ + (x+y)NH3 →Na+(NH3)x + e.(NH3)y
K + O2(excess) → KO2 Paramagnetic
- \(O_{-2}\) is paramagnetic due to unpaired electron in antibonding orbital
3Cu + 8HNO3(diluted) → 3Cu(NO3)2 + 2NO + 4H2O
- NO is paramagnetic due to unpaired electrons on ''N''.
where ''H2O2'' is diamagnetic.