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Activity Series (OR) Electro chemicals series

Question

Zn gives H₂ gas with H₂SO₄ and HCI but not with HNO₃ because

Easy

A

Zn acts as oxidant when reacts with HNO₃
B

HNO₃ is weaker acid than H₂SO₄ and HCI
C

In electrochemical series Zinc is above hydrogen
D

NO₃^– is reduced in preference to H₃O⁺

Solution

In HNO_{3 ,}H⁺can reduce to H₂ and NO^-₃ can reduce to NO or N₂O, NO_2.
$E_{{H^ + }_{\left( {1M} \right)}}^o/{H_{{2_{\left( {1atm} \right)}}}} = 0\;where as {E^{0}_{NO_{3}^{-}/NO}},{E^{0}_{NO_{3}^{-}/N_{2}O}},{E^{0}_{NO_{3}^{-}/NO_{2}}},\;are\; positive$
So NO^-₃reduces in preference to H⁺or H₃O⁺when HNO₃ acts like oxidant.

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