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 O_2.

Ionic mobility of Ag⁺ is ($\mathrm{\lambda }$_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) + H_{2 (g)} → 2HCl _(aq) + 2Ag _(s)
taking place in a galvanic cell is represented by the notation

• Pt_(s)| H_{2 (g)}, 1 bar | 1 M KCl _(aq) | AgCl _(s) | Ag _(s)

• Pt_(s)| H_{2 (g)}, 1 bar | 1 M HCl _(aq) | 1M Ag⁺_(aq) | Ag _(s)

• Pt_(s)| H_{2 (g)}, 1 bar | 1 M HCl _(aq) | AgCl _(s) | Ag _(s)

• Pt_(s)| H_{2 (g)}, 1 bar | 1 M KCl _(aq) | Ag _(s) | AgCl _(s)

Assertion: For the Daniel cell, Zn/Zn²⁺||Cu²⁺|Cu with E_cell= 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.

377.

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 $\rightleftharpoons$ $\frac{1}{2}$A₂ + $\frac{1}{2}$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⁺