The standard emf of the cell E cell ° and equilibrium constant K eq of the following reaction of 298 K Cd 2 + + 4 NH 3 ⇌ Cd NH 3 4 2 +

E cell ° = 0 . 21 V , K eq = 126 × 10 7

E cell ° = 1 . 0 V , K eq = 1 . 26 × 10 7

E cell ° = 1 . 0 V , K eq = 6 . 60 × 10 33

E cell ° = 021 V , K eq = 6 . 60 × 10 33

E M B I B E

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 9 - Electrochemistry>AMU-AT (B.Tech.) 2019>Q 4

EASY

AMU-AT (B.Tech.)

IMPORTANT

Earn 100

Which colourless gas evolves when ${NH}_{4} Cl$ reacts with zinc in a dry cell battery ?

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Important Questions on Electrochemistry

MEDIUM

AMU-AT (B.Tech.)

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 9 - Electrochemistry>AMU-AT (B.Tech.) 2019>Q 5

Ionic mobility of

{Ag}^{+}

is

(λ_{{Ag}^{+}} = 5 \times 10^{- 1} {ohm}^{- 1} {cm}^{2} {eq}^{- 1})

MEDIUM

AMU-AT (B.Tech.)

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 9 - Electrochemistry>AMU-AT (B.Tech.) 2019>Q 6

The standard e.m.f. of the cell, $Cd (s) |{CdCl}_{2} (aq) (0.1 M)| | AgCl (s) | Ag (s)$ in which the cell reaction is $Cd (s) + 2 AgCl (s) ⟶ 2 Ag (s) + {Cd}^{2 +} (aq) + 2 {Cl}^{-} (aq)$ is $0.6915 V$ at $0 ° C$ and $0.6753 V$ at $25 ° C$ . The enthalpy change of the reaction at $25 ° C$ is