Which of the following reactions represents the laboratory preparation of hydrogen?
a
C(s) + H 2 O(l) → CO(g) + H2(g)
b
2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
c
Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g)
d
Cu(s) + H2O(l) → CuO(s) + H2(g)
e
2AI(s) + 3H2O(l) → Al2O3(s) + 3H2(g)
Explanation
Correct Option
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Discussions (7)
ojjmanuel
9 years ago
The question is wrongly composed:
the laboratory preparation of hydrogen. are in three was
action of zinc on an acid
action of sodium on cold water
action of iron on steam
so B and C is the answer because sodium can also react cold water to produce H
REF: New school chemistry Page 344
emmyfunzamize
1 year ago
The question is correct, because sodium can't be use in the laboratory preparation, because it's react explosively with water, so it's is dangerous for lab preparation . Although it will also give H2
