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

Engineering

Chemistry

Alkali Metals and Properties

Dichromate and Permanganate Ion Reactions

Metal Ammonia Solution

Question

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

Cu and dilute HNO₃

Na and excess of NH₃

O₂ and 2-ethylanthraquinol

K and excess of O₂

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[A] Na + (x+y)NH₃ → [Na(NH₃)_x]⁺ + y e¯ (paramagnetic)

Blue colour solution

[B] K + O₂ → K^$\oplus$O₂¯ (paramagnetic)

[C] Cu + dil HNO₃ → Cu(NO₃)₂ + H₂O + NO (paramagnetic)

[D] O₂ + 2-ethylanthraquinol will give H₂O₂ (diamagnetic)