1
JEE Main 2022 (Online) 25th June Evening Shift
Numerical
+4
-1
Change Language

A solution of Fe2(SO4)3 is electrolyzed for 'x' min with a current of 1.5 A to deposit 0.3482 g of Fe. The value of x is ___________. [nearest integer]

Given : 1 F = 96500 C mol$$-$$1

Atomic mass of Fe = 56 g mol$$-$$1

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2
JEE Main 2022 (Online) 25th June Morning Shift
Numerical
+4
-1
Change Language

In a cell, the following reactions take place

$$\matrix{ {F{e^{2 + }} \to F{e^{3 + }} + {e^ - }} & {E_{F{e^{3 + }}/F{e^{2 + }}}^o = 0.77\,V} \cr {2{I^ - } \to {I_2} + 2{e^ - }} & {E_{{I_2}/{I^ - }}^o = 0.54\,V} \cr } $$

The standard electrode potential for the spontaneous reaction in the cell is x $$\times$$ 10$$-$$2 V 298 K. The value of x is ____________. (Nearest Integer)

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3
JEE Main 2022 (Online) 24th June Evening Shift
Numerical
+4
-1
Change Language

The resistance of a conductivity cell containing 0.01 M KCl solution at 298 K is 1750 $$\Omega$$. If the conductivity of 0.01 M KCl solution at 298 K is 0.152 $$\times$$ 10$$-$$3 S cm$$-$$1, then the cell constant of the conductivity cell is ____________ $$\times$$ 10$$-$$3 cm$$-$$1.

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4
JEE Main 2022 (Online) 24th June Morning Shift
Numerical
+4
-1
Change Language

The cell potential for the following cell

Pt |H2(g)|H+ (aq)|| Cu2+ (0.01 M)|Cu(s)

is 0.576 V at 298 K. The pH of the solution is __________. (Nearest integer)

(Given : $$E_{C{u^{2 + }}/Cu}^o = 0.34$$ V and $${{2.303\,RT} \over F} = 0.06$$ V)

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