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Electrochemistry
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Aluminium oxide may be electrolysed at 1000o C to furnish aluminium metal (Atomic mass = 27 amu; 1 Faraday = 96,500 Coulombs). The cathode reaction is
Al3+ +3e- → Alo
To prepare 5.12 kg of aluminium metal by this method would require
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5.49 x 107 C of electricity
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1.83 x 107 C of electricity
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1.49x 107 C of electricity
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5.49 x 101 C of electricity
A.
5.49 x 107 C of electricity
Calomel (Hg2Cl2) on reaction with ammonium hydroxide gives
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HgNH2Cl
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NH2 – Hg – Hg – Cl
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Hg2O
-
HgO
A.
HgNH2Cl
Hg2Cl2 + 2NH4OH → Hg + Hg(NH2)Cl + NH4Cl + 2H2O
Consider the following E° values
Under standard conditions the potential for the reaction
Sn(s) + 2Fe3+(aq) → 2Fe2+(aq) + Sn2+(aq) is
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1.68 V
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0.63 V
-
0.91 V
-
1.40 V
C.
0.91 V
Four successive members of the first-row transition elements are listed below with atomic numbers. Which one of them is expected to have the highest 
value?
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Cr (Z =24)
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Mn(Z =25)
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Fe (Z = 26)
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Co (Z= 27)
D.
Co (Z= 27)
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Mock Test Series
Mock Test Series