D-And F-Block Elements Ques 189
Question: Which one of the following metals will not reduce $ H_2O $
[EAMCET 1997]
Options:
A) $ Ca $
B) $ Fe $
C) $ Cu $
D) $ Li $
Show Answer
Answer:
Correct Answer: C
Solution:
$ Cu+H_2O\to $ No reaction
$ E_{L{{i}^{+}}/Li}^{0}=-3.04V $
$ E_{{{H}^{+}}/H_2}^{0}=0.00,V $
$ E_{C{{a}^{+}}/Ca}^{0}=-2.87,V $
$ E_{C{{u}^{+}}/Cu}^{0}=+0.34,V $
$ Cu $ comes below H in the electrochemical series. Hence, unable to displace hydrogen from water.
