S Block Elements Question 234
Question: $ K, $ $ Ca $ and $ Li $ metals may be arranged in the decreasing order of their standard electrode potentials as
[CPMT 1990]
Options:
A) $ K, $ $ Ca, $ $ Li $
B) $ Li, $ $ K, $ $ Ca $
C) $ Li, $ $ Ca, $ $ K $
D) $ Ca, $ $ Li, $ $ K $
Show Answer
Answer:
Correct Answer: B
Solution:
$ L{{i}^{+}}+{{e}^{-}}\to Li $ , $ E^{o}=-3.05\ V $
$ {{K}^{+}}+{{e}^{-}}\to K $ , $ E^{o}=-2.93\ V $
$ C{{a}^{+2}}+2{{e}^{-}}\to Ca $ , $ E^{o}=-2.87\ V $
BETA
