Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Electrochemistry question

2005 · Q93
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /NEET
  3. /Chemistry
  4. /Electrochemistry
  5. /2005 · Q93

Electrochemistry question

2005 · Q93

NEETChemistryElectrochemistryMCQ+4 / −1
The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is
(Atomic mass : Al = 27)
  1. A
    270 kg
  2. B
    540 kg.
  3. C
    90 kg
  4. D
    180 kg
View written solutionFree

Correct answer: C

2Al2O3 + 3C →\to→ 4Al + 3CO2

From the above equation,

3 mol × 12 g mol–1 = 36 g of carbon is consumed

to give 4 mol × 27 g mol–1 = 108 g of Al

So, 108 g of Al is produced by 36 g of carbon

∴\therefore∴ 270000 g of Al is produced by

= 36108×270000{{36} \over {108}} \times 27000010836​×270000 of C

= 90000 g of C

= 90 kg of C

PreviousNext

More from Electrochemistry

  • The standard e.m.f. of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25oC. The equilibrium constant of the reaction would be2004 · MCQ
  • The e.m.f. of a Daniell cell at 298 K is E1. When the concentration of ZnSO4 is 1.0 M and that of CuSO4 is 0.01 M, the e.m.f. changed to E2. What is the relationship between E1 and E2? Includes diagram2003 · MCQ
  • On the basis of the information available from the reaction, 4/3Al + O2 → 2/3Al2O3, ΔG = − 827 kJ mol−1 of O2, the minimum e.m.f. required to carry out an electrolysis of Al2O3 is (F = 96500 C mol−1)2003 · MCQ
  • In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam2002 · MCQ
  • Standard electrode potentials are Fe2+/Fe [Eo = −0.44] and Fe3+/Fe2+[ Eo = 0.77]; If Fe2+, Fe3+ and Fe blocks are kept together, then2001 · MCQ
  • Cell reaction is spontaneous when2000 · MCQ
  • Equivalent conductances of Ba2+ and Cl− ions are 127 and 76 ohm−1 cm−1 eq−1 respectively. Equivalent conductance of BaCl2 at infinite dilution is2000 · MCQ
  • For the disproportionation of copper 2Cu+ → Cu2+ + Cu, Eo is (Given Eo for Cu2+/Cu is 0.34 V and Eo for Cu2+/Cu+ is 0.15 V.)2000 · MCQ