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Which of the following is not an example of a metathesis reaction ?
A.
HNO 3 (aq) + KOH (aq) → H 2 O (aq) + KNO 3 (aq)
B.
2Cr(NO 3 ) 3 (aq) + 3(NH 4 ) 2 CO 3 (aq) → Cr 2 (CO 3 ) 3 (s) + 6NH 4 NO 3 (aq)
C.
2HCl (aq) + Na 2 S (s) → NaCl (aq) + H 2 S (g)
D.
Mg (s) + 2HNO 3 (aq) → H 2 (g) + Mg(NO 3 ) 2 (aq)
E.
Both (C) and (D) are not examples of metathesis reactions