1.

The pair(s) of reagents that yeild paramagnetic species is/are

Answer»

Na and excess of `NH_(3)`
K and excess of `O_(2)`
CU and dilute `HNO_(3)`
`O_(2)` and 2-ethylanthraquinol.

Solution :`Na+UNDERSET(("excess"))((x+y)NH_(3))to[Na(NH_(3))_(x)]^(+)+underset(("Paramagnetic"))underset("SOLVATED" e^(-))(e^(-)(NH_(3))_(y))`
`underset(("excess"))(K+O_(2))tounderset(("Paramagnetic"))underset("Potassium superoxide")(KO_(2))`
`3Cu+8HNO_(3(DIL"))to3Cu(NO_(3))_(2)+underset(("Paramagnetic"))(2NO+4H_(2)O)`


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