Solve this 

Q .       W h i c h   o f   t h e   f o l l o w i n g   m e t a l   d o   n o t   e v o l v e   H 2   g a s   f r o m   d i l .   a c i d   ? ( 1 )       A E A + / A °   =   0 . 25   V                                                             ( 2 )       B E B / B + °   =   +   0 . 22   V ( 3 )       C E C + / C °   =   -   0 . 30   V                                                   ( 4 )       D E D / D + °   =   +   0 . 44   V

Dear Student

The metal having the positive reduction potential cannot evolve H2 gas from dil. acid because It will act as an oxidising agent so it can not reduce the acid. The metal having minus reduction potential can evolve H2 gas. Your options are wrong.

Regards

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