Standard reduction electrode potential at Zn^ 2+ /Zn is −0.76 V. This means

JEE Advanced Chemistry question

Standard reduction electrode potential at is −0.76 V. This means

(A)ZnO is reduced to Zn by
(B)Zn liberates with conc. acidsCorrect
(C)Zn is generally the anode in an electrochemical cellCorrect
(D)Zn is generally the cathode in an electrochemical cell

Answer: (B),(C)

Solution

A strongly negative means metallic zinc is a comparatively strong reducing agent — well below hydrogen in the electrochemical series — so it readily displaces from acids (b), and it is preferentially oxidized, i.e. it typically serves as the anode in a galvanic cell (c) (as in the Daniell

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Question ID VK-159904