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Electrochemistry question

2020 · Q98
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Electrochemistry question

2020 · Q98

NEETChemistryElectrochemistryMCQ+4 / −1
The number of Faradays(F) required to produce 20 g of calcium from molten CaCl2 (Atomic mass of Ca = 40 g mol-1) is :
  1. A
    2
  2. B
    3
  3. C
    4
  4. D
    1
View written solutionFree

Correct answer: D

1 equivalent of any substance is deposited by 1F of charge.
We have 20g calcium.
No. of equivalent = given  massequivalent  mass{{given\;mass} \over {equivalent\;mass}}equivalentmassgivenmass​
Ca2+ + 2e−-− →\to→ Ca(s)
v.f. = 2
According to Faraday's 1st law
Charge passed in Faradey = g. equivalent of product
= 2040×2{{20} \over {40}} \times 24020​×2 = 1 F
So, 1 F of charge is required.

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