Q.

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
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The correct order of chemical reactivity with water according to electrochemical series