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JIPMER 2007
Exam
JIPMER
Year
2007
Subject
Chemistry
Chapter
Electrochemistry

JIPMER 2007 · Chemistry · Electrochemistry

4.5 g of aluminium (Atomic mass 27 amu) is deposited at cathode...

4.5 g of aluminium (Atomic mass 27 amu) is deposited at cathode from Al3+\mathrm{Al}^{3+} solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from H+\mathrm{H}^{+}ions in solution by the same quantity of electric charge will be

Options

  1. A22.4 L
  2. B44.8 L
  3. C5.6 L
  4. D11.2 L

Correct answer

C. 5.6 L

Step-by-step solution

From second law of Faraday mAlmH=EAlEH\frac{m_{\mathrm{Al}}}{m_{\mathrm{H}}}=\frac{E_{\mathrm{Al}}}{E_{\mathrm{H}}} ∴4.5mH=27/31\therefore \frac{4.5}{m_{\mathrm{H}}}=\frac{27 / 3}{1} or mH=0.5 gm_{\mathrm{H}}=0.5 \mathrm{~g} ∵2 gH2\because 2 \mathrm{~g} \mathrm{H}_2 volume at STP=22.4 L\mathrm{STP}=22.4 \mathrm{~L} ∴0.5 gH2\therefore 0.5 \mathrm{~g} \mathrm{H}_2 volume at STP =22.4×0.52 L=5.6 L=\frac{22.4 \times 0.5}{2} \mathrm{~L}=5.6 \mathrm{~L}
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