All of the following combinations of elements or compounds will react to produce hydrogen gas EXCEPT
a.MgH2(s) and H2O(λ).
b.Na2S(s) + HCl(aq).
c.Ca(s) + HCl(aq).
d.Na(s) and H2O(λ).
e.Al(s) + KOH(aq).
2007-12-15 04:15:28 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
MgH2 + 2 H2O - Mg(OH)2 + 2 H2
Na2S + 2 HCl = 2 NaCl + H2S
Ca + 2HCl = CaCl2 + H2
2 Na + 2H2O = 2 NaOH + H2
2Al + 2KOH + 6H2O = 2KAl(OH)4 + 3 H2; it is not possible to produce K in the presence of water.
2007-12-15 09:57:15 · answer #1 · answered by Facts Matter 7 · 0⤊ 0⤋
According to the reactivity series or the activity series of metals , mercury is less reactive than hydrogen. so mercury will not be able to displace hydrogen from HCl more reactive elements displace less reactive elements from their compounds.
2016-05-24 02:02:53 · answer #2 · answered by ? 3 · 0⤊ 0⤋
Al (s) + 3KOH >> Al(OH)3 + 3K
2007-12-15 04:18:37 · answer #3 · answered by Dr.A 7 · 0⤊ 1⤋