Question

Which of the following are not single-displacement reactions?

A. KOH (aq) + HNO3 (aq) → H2O (l) + KNO3 (aq)
B. Ca (s) + 2H2O (l) → Ca(OH)2 (aq) + H2 (g)
C. Na2S (aq) + 2HCl (aq) → 2NaCl (aq) + H2S (g)
D. Fe (s) + 2HCl (aq) → FeCl2(aq) + H2 (g)

Answer 1

@sarah786 any thoughts

Answer 2

I think C , not sure :/

Answer 3

it can be more than one. :)

Answer 4

A too .

Answer 5

I believe it's A and C too, just to confirm. XP

Answer 6

A is an acid-base neutralization, and C is a gas-evolving reaction.