What is the time (in sec) required for depositing all the silver present in 125 mL of 1 M AgNO₃ solution by passing a current of 241.25 A? (1F = 96500 coulombs)

• 10

• 50

• 1000

• 100

Electrolysis of X gives Y at anode. Vacuum distillation of Y gives H₂O. The number of peroxy (O-O) bonds present in X and Y respectively are :

• 1, 1

• 1, 2

• zero, 1

• zero, zero

Assertion (A) : A current of 96.5 A is passed into aqueous AgNO₃ solution for 100 s. The weight of silver deposited is 10.8 g (At. wt. of Ag = 108)

Reason (R) : The mass of a substance deposited during the electrolysis of an electrolyte is inversely proportional to the quantity of electricity passing through the electrolyte.

The correct answer is :

• Both (A) and (R) are true and (R) is the correct explanation of (A).

• Both (A) and (R) are true but (R) is not the correct explanation of (A).

• (A) is true but (R) is false.

• (A) is false but (R) is true.

When same quantity of electricity is passed through aqueous AgNO₃ and H₂SO₄ solutions connected in series, 5.04 × 10^-2 g of H₂ is liberated. What is the mass of silver (in grams) deposited ? (Eq. wts. of hydrogen = 1.008, silver = 108)

• 54

• 0.54

• 5.4

• 10.8

When electric current is passed through acidified waterfor 1930 s, 1120 mL of H₂ gas is collected (at STP) at the cathode. What is the current passed in amperes ?

• 0.05

• 0.50

• 5.0

• 50

Calculate the emf of the cell Cu(s)|Cu²⁺(aq)|| Ag⁺ (aq)| Ag(s). Given ${\mathrm{E}}_{{\mathrm{Cu}}^{2+}/\mathrm{Cu}}^{°} = +0.34 \mathrm{V}, {\mathrm{E}}_{{\mathrm{Ag}}^{+}/ \mathrm{Ag}}^{°} = 0.80 \mathrm{V}$.

• +0.46 V

• +1.14 V

• +0.57V

• -0.46 V

A solution of concentration C g equiv/L has a specific resistance R. The equivalent conductance of the solution is

• R/C

• C/R

• 1000/RC

• 1000R/C

For the following cell reaction,

Ag | Ag⁺ | AgCl | Cl${}^{⊝}$ | Cl₂, Pt

$∆{\mathrm{G}}_{\mathrm{f}}^{°}$ (AgCl) = - 109 kJ/ mol

$∆{\mathrm{G}}_{\mathrm{f}}^{°}$ (Cl^{${}^{⊝}$}) = -129 kJ/ mol

$∆{\mathrm{G}}_{\mathrm{f}}^{°}$(Ag⁺) = 78 kJ/ mol

E° of the cell is

• -0.60 V

• 0.60 V

• 6.0 V

• None of these

Which one of the following is most effective in causing the coagulation of an As₂S₃ sol?

• KCl

• AlCl₃

• MgSO₄

• K₃Fe(CN)₆

At a certain temperature and at infinite dilution, the equivalent conductances of sodium benzoate, hydrochloric acid and sodium chlonde are 240, 349 and 229 ohm^-1 cm²equiv^-1 respectively. The equivalent conductance of benzoic acid in ohm^-1 cm²equiv^-1 at the same conditions is

• 80

• 328

• 360

• 408