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AIIMS 2010
Exam
AIIMS
Year
2010
Subject
Chemistry
Chapter
Electrochemistry

AIIMS 2010 · Chemistry · Electrochemistry

A factory produces 40 ~kg of calcium in two hours by electrolysis....

A factory produces 40 kg40 \mathrm{~kg} of calcium in two hours by electrolysis. How much aluminium can be produced by same current in 2 hours if current efficiency is 50%50 \% ?

Options

  1. A22 kg22 \mathrm{~kg}
  2. B18 kg18 \mathrm{~kg}
  3. C9 kg9 \mathrm{~kg}
  4. D27 kg27 \mathrm{~kg}

Correct answer

C. 9 kg9 \mathrm{~kg}

Step-by-step solution

WCaECa=WAlEAl⇒4020=WAl9⇒WAl=18 kg\frac{W_{\mathrm{Ca}}}{E_{\mathrm{Ca}}}=\frac{W_{\mathrm{Al}}}{E_{\mathrm{Al}}} \Rightarrow \frac{40}{20}=\frac{W_{\mathrm{Al}}}{9} \Rightarrow W_{\mathrm{Al}}=18 \mathrm{~kg} As current efficiency is 50%so,WAl=9 kg50 \% \mathrm{so}, W_{\mathrm{Al}}=9 \mathrm{~kg}
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