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Earn 100

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)

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Important Questions on Electrochemistry

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The anodic half-cell of lead-acid battery is recharged using electricity of 0.05 Faraday. The amount of PbSO4  electrolyzed in g during the process is: (Molar mass of PbSO4=303g mol-1)
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Consider the following reduction processes:

Zn2++2e-Zn(s);Eo=-0.76V

Ca2++2e-Ca(s);Eo=-2.87V

Mg2++2e-Mg(s);Eo=-2.36V

Ni2++2e-Ni(s);Eo=-0.25V

The reducing power of the metals increases in the order:
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In the cell:

Pt(s)H2(g,1bar)HCl(aq)|AgCl(s)|Ag(s)Pt(s)

The cell potential is 0.92V when a 10-6 molal HCl solution is used. The standard electrode potential of (AgCl/Ag,C-) electrode is:

 Given, 2.303RTF=0.06 Vat 298k

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For the cell Zn(s)Zn2+(aq)Mx+(aq)M(s), different half cells and their standard electrode potentials are given below:

Mx+(aq)/M(s) Au3+(aq)/Au(s) Ag+(aq)/Ag(s) Fe3+(aq)/Fe2+(aq) Fe2+(aq)/Fe(s)
E°Mx+/M(V) 1.40 0.80 0.77 -0.44

If EZn2+/Zn=-0.76V, which cathode will give a maximum value of Ecell ° per electron transferred?

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mo for NaCl,HCl and NaA are 126.4,425.9 and 100.5Scm2mol-1 respectively. If the conductivity of 0.001MHA is 5×10-5 S cm-1, degree of dissociation of HA is
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Which of the following options will be correct for the stage of half completion of the reaction AB?
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The standard electrode potentials (reduction) of Pt/Fe3+, Fe2+ and Pt/Sn4+, Sn2+ are +0.77V and 0.15V respectively at 25°C. The standard EMF of the reaction Sn4++2Fe2+Sn2++2Fe3+ is:
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The standard oxidation potentials, E°, for the half reactions are as:

ZnZn2++2e-;E°=+0.76V FeFe2++2e-;E°=+0.41V

The EMF for the cell:

Fe2++ZnZn2++Fe