The correct order of chemical reactivity with water according to electrochemical series
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a
Mg > Zn > Cu > K
b
K > Mg > Zn > Cu
c
K > Zn > Mg > Cu
d
Cu > Zn > Mg > K
answer is B.
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Detailed Solution
The standard reduction potential of K+,Mg2+,Zn+2,Cu2+ increase in this order. Metal electrode having SRP lesser than Standard electrode potential liberates H2 gas whille +ve SRP does not liberates H2Lesser the SRP more readily liberates H2