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

Options

A. Na and excess of `NH_(3)`
B. K and excess of `O_(2)`
C. Cu and dilute `HNO_(3)`
D. `O_(2) and 2 - ethylanthraquinol

Answer

A, B, C

Explanation

If ammonia considered as a liquid then reaction will be
A `M+(x+y)NH_(3)rarr[M(NH)_(3)_(x)]^(+)+[e(NH)_(3)_(y)]^(-)`
B `K+O_(2)rarrKO_(2)[k^(+),O_(2)^(-)`paramagnetic
C `3Cu+8HNO_(3) rarr3 Cu(NO_(3))+_(2)+2NO+4H_(2)O`