Q.

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

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a

Cu and dilute HNO3

b

Na and excess of NH3

c

K and excess of O2

d

O2 and 2-ethylanthraquinol

answer is A, B, C.

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Detailed Solution

Na+NH3 (excess)dilute solution of sodium in liquid NH3

                                                                 (Which is paramagnetic)

K+O2(excess)KO2(CO2 is paramagnetic)

Cu + dilute HNO3CuNO32+NO

                                      (NO is paramagnetic)

O2+2-ethylanthraquinol2-ethylanthraquinone

                                             +H2O2 (Diamagnetic)

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