Anode in the galvanic cell is :
negative electrode
positive electrons
neutral electrode
none of the above
When Cu reacts with AgNO3 solution , the reaction takes place is :
Oxidation of Cu
Reduction of Cu
Oxidation of Ag
Reduction of NO3-
The products formed when an aqueous solution of NaBr is electrolysed in a cell having inert electrodes are
Na and Br2
Na and O2
H2, Br2 and NaOH
H2 and O2.
Ionic mobility of Ag+ is (Ag+ = 5 x 10-1 ohm-1 cm2 eq-1) :
5.2 x 10-9
2.4 x 10-9
1.52 x 10-9
8.25 x 10-9
The chemical reaction,
2AgCl (s) + H2 (g) → 2HCl (aq) + 2Ag (s)
taking place in a galvanic cell is represented by the notation
Pt(s)| H2 (g), 1 bar | 1 M KCl (aq) | AgCl (s) | Ag (s)
Pt(s)| H2 (g), 1 bar | 1 M HCl (aq) | 1M Ag+(aq) | Ag (s)
Pt(s)| H2 (g), 1 bar | 1 M HCl (aq) | AgCl (s) | Ag (s)
Pt(s)| H2 (g), 1 bar | 1 M KCl (aq) | Ag (s) | AgCl (s)
B.
Pt(s)| H2 (g), 1 bar | 1 M HCl (aq) | 1M Ag+(aq) | Ag (s)
2AgCl(s) + H2(g) → 2HCl(aq) + 2Ag(s)
The activities of solids and liquids are taken as unity and at low concentrations, the activity of a solute is approximated to its molarity. The cell reaction will be
Pt(s) | H2 (g), 1 bar | H+(aq) 1 M || AgCl(aq) 1M | Ag(s)
Assertion: For the Daniel cell, Zn/Zn2+||Cu2+|Cu with Ecell= 1.1V, application of opposite potential greater than 1.1 V results into flow of electron from cathode to anode.
Reason : Zn is deposited at anode and Cu is dissolved at cathode.
If both assertion and reason are true and reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true, but reason is false.
Both assertion and reason are false statements.
Assertion : Fe3+ can be used for coagulation of As2S3 sol.
Reason: Fe3+ reacts with As2S3 to give Fe2S3.
If both assertion and reason are true and reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true, but reason is false.
Both assertion and reason are false statements.
Assertion : Galvanised iron does not rust.
Reason : Zinc has a more negative electrode potential than iron.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
If equilibrium constant for reaction 2AB A2 + B2 is 49, then the equilibrium constant for reaction
AB A2 + B2, will be;
7
280
49
0.01
The E° for half cells Fe/Fe2+ and Cu/Cu2+ are -0.44 V and +0.32 V respectively. Then :
Cu2+ oxidises Fe
Cu2+ oxidises Fe2+
Cu oxidises Fe2+
Cu reduces Fe2+