Which of the following combination(s) can produce a paramagnetic gas?

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The question asks which reactions produce a paramagnetic gas.

B. Copper ( $C u$ ) with concentrated $H N O_{3}$ produces nitrogen dioxide ( $N O_{2}$ ), a paramagnetic gas.

$C u + 4 H N O_{3} (co n c .) \to C u (N O_{3})_{2} + 2 N O_{2} + 2 H_{2} O$

D. Lead ( $P b$ ) with dilute $H N O_{3}$ produces nitric oxide ( $NO$ ), which is also a paramagnetic gas.

$3 P b + 8 H N O_{3} (d i l .) \to 3 P b (N O_{3})_{2} + 2 NO + 4 H_{2} O$

$NO$ and $N O_{2}$ are paramagnetic due to unpaired electrons.

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