Electrochemistry · JEE Main previous year questions

2005 3 questions

1. Q1782005 · 28 Apr 2005 · Shift 1

   The highest electrical conductivity of the following aqueous solutions is of :

   1. A.0.1 M acetic acid
   2. B.0.1 M chloroacetic acid
   3. C.0.1 M fluoroacetic acid
   4. D.0.1 M difluoroacetic acid
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   Answer: D

2. Q1792005 · 28 Apr 2005 · Shift 1

   Aluminium oxide may be electrolysed at $1000^{\circ }\mathrm{C}$ to furnish aluminium metal (Atomic mass $=27\mathrm{amu}$; 1 Faraday $=96,500\mathrm{Coulombs}$). The cathode reaction is $\mathrm{A}{\mathrm{l}}^{3+}+3{\mathrm{e}}^{-}\to \mathrm{A}{\mathrm{l}}^0$ To prepare $5.12\mathrm{kg}$ of aluminium metal by this method would require

   1. A.$5.49\times 10^7\mathrm{C}$ of electricity
   2. B.$1.83\times 10^7\mathrm{C}$ of electricity
   3. C.$5.49\times 10^4\mathrm{C}$ of electricity
   4. D.$5.49\times 10^1\mathrm{C}$ of electricity
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   Answer: A

3. Q2172005 · 28 Apr 2005 · Shift 1

   During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’ These are

   1. A.Sn and Ag
   2. B.Pb and Zn
   3. C.Ag and Au
   4. D.Fe and Ni
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   Answer: C