####47. The nitrogen oxide(s) that contain(s) $N-N$ bond(s) is/are
(a) $N _2 O$
(b) $N _2 O _3$
(c) $N _2 O _4$
(d) $N _2 O _5$
(2009)
(a)
(c)
(b) $O$
(d) (a), (b), (c) have $N-N$ bonds
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