1

JEE Main 2018 (Offline)

MCQ (Single Correct Answer)

+4

-1

How long (approximate) should water be electrolysed by passing through 100 amperes current so that the
oxygen released can completely burn 27.66 g of diborane?

(Atomic weight of B = 10.8 u)

(Atomic weight of B = 10.8 u)

2

JEE Main 2018 (Online) 15th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

When an electric currents passed through acidified water, 112 mL of hydrogen gas at N.T.P. was collected at the cathode in 965 seconds. The current passed, in ampere, is :

3

JEE Main 2017 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

To find the standard potential of M

The emf of the cell is found to be 0.421 volt at 298 K. The standard potential of half reaction M3

(Given $$E_{A{g^ + }\,/\,Ag}^ - $$ at 298 K = 0.80 Volt)

^{3+}/M electrode,the following cell is constituted : Pt/M/M^{3+}(0.001 mol L^{−1})/Ag^{+}(0.01 mol L^{−1})/AgThe emf of the cell is found to be 0.421 volt at 298 K. The standard potential of half reaction M3

^{+ }+ 3e^{−}$$ \to $$ M at 298 K will be :(Given $$E_{A{g^ + }\,/\,Ag}^ - $$ at 298 K = 0.80 Volt)

4

JEE Main 2017 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

+4

-1

What is the standard reduction potential (E

Given that :

Fe

Fe

^{o}) for Fe^{3+}$$ \to $$ Fe ?Given that :

Fe

^{2+}+ 2e^{$$-$$}$$ \to $$ Fe; $$E_{F{e^{2 + }}/Fe}^o$$ = $$-$$0.47 VFe

^{3+}+ e^{$$-$$}$$ \to $$ Fe^{2+}; $$E_{F{e^{3 + }}/F{e^{2 + }}}^o$$ = +0.77 VQuestions Asked from Electrochemistry (MCQ (Single Correct Answer))

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