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Question

The cost of electrical energy to deposit 2.0g from molten calcium chloride solution is 10 rupees.The amount to be spend to liberate 11.2L of oxygen is


  1. 150 rupees

  2. 50 rupees

  3. 100 rupees

  4. 200 rupees


Solution

The correct option is B

50 rupees


Number of equivalents of Ca  liberated=Number of equivalents of O2 liberated= 5.6 / 11.2=0.5 equivalents
(equivalent mass of O2 is = 8 gwhich occupies 5.6 lit volume at STP)
2 g of Ca = 2 / 20 = 0.1 equivalent
Cost of 0.1 eq of Ca =10Rs

Cost of 0.5 eq of Ca = (0.5/0.1) x 10  =  50 Rs

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