A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of the electrode would be:

 1 0.59 V 2 0.118 V 3 1.18 V 4 0.059 V
Subtopic:  Relation between Emf, G, Kc & pH |
74%
From NCERT
AIPMT - 2013
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The Gibb's energy for the decomposition of $$\mathrm{A l_{2} O_{3}}$$ at $$\mathrm{500~ ^\circ C}$$ is as follows:

2/3Al2O3 → 4/3Al + O2 ; ∆rG = + 960 k J mol–1

The potential difference needed for the electrolytic reduction of aluminium oxide (Al2O3) at $$\mathrm{500~ ^\circ C}$$ is at least,

1. 3.0 V

2. 2.5 V

3. 5.0 V

4. 4.5 V

Subtopic:  Relation between Emf, G, Kc & pH |
61%
From NCERT
AIPMT - 2012
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If the  ${E}_{cell}^{}$ $0$for a given reaction has a negative value, then which of the following gives the correct relationship for the values of $∆{G}^{0}$  $and$   ${K}_{eq}$?

1.  $∆{\mathrm{G}}^{0}<0;$ ${\mathrm{K}}_{\mathrm{eq}}>1$

2.  $∆{\mathrm{G}}^{0}<0;$ ${\mathrm{K}}_{\mathrm{eq}}<1$

3.  $∆{\mathrm{G}}^{0}>0;$ ${\mathrm{K}}_{\mathrm{eq}}<1$

4.  $∆{\mathrm{G}}^{0}>0;$ ${\mathrm{K}}_{\mathrm{eq}}>1$

Subtopic:  Electrolytic & Electrochemical Cell | Relation between Emf, G, Kc & pH |
78%
From NCERT
AIPMT - 2011
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Given:
(i) ${\mathrm{Cu}}^{2+}+2{\mathrm{e}}^{-}\to \mathrm{Cu}$    Eo = 0.337 V
(ii) ${\mathrm{Cu}}^{2+}+{\mathrm{e}}^{-}\to {\mathrm{Cu}}^{+}$  Eo = 0.153 V
Electrode potential, Eo for the reaction,
${\mathrm{Cu}}^{+}+{\mathrm{e}}^{-}\to \mathrm{Cu}$, will be:

1. 0.52 V

2. 0.90 V

3. 0.30 V

4. 0.38 V

Subtopic:  Relation between Emf, G, Kc & pH |
75%
From NCERT
AIPMT - 2009
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The correct order of ionic mobility of ions in an aqueous solution is:
1. K+> Na+> Rb+> Cs+
2. Cs+> Rb+> K+> Na+
3. Rb+> K+> Cs+> Na+
4. Na+> K+> Rb+> Cs+
Subtopic:  Relation between Emf, G, Kc & pH |
75%
From NCERT
AIPMT - 2008
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For a given reaction,
Cu(s) + 2Ag+ (aq) → Cu2+(aq)+2Ag(s);
E0=0.46 V at 298 K . The equilibrium constant will be :

1. $2.4×{10}^{10}$

2. $2.0×{10}^{10}$

3. $4.0×{10}^{10}$

4. $4.0×{10}^{15}$

Subtopic:  Nernst Equation | Relation between Emf, G, Kc & pH |
62%
From NCERT
AIPMT - 2007
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