| The number of Faradays(F) required to produce 20 g of calcium from molten \[CaC{{l}_{2}}\] |
| (Atomic mass of\[Ca=40\text{ }g\text{ }mo{{l}^{1}}\]) is [NEET 2020] |
A) 2
B) 3
C) 4
D) 1
Correct Answer: D
Solution :
| [d] 1 equivalent of any substance is deposited by 1 F of charge. |
| We have, 20 g calcium |
| Number of equivalents \[\text{=}\frac{\text{Given}\,\,\text{mass}}{\text{Equivalent}\,\,\text{mass}}\] |
| \[\text{=}\frac{20}{20}=1\] |
| Equivalent mass of \[Ca=\frac{40}{2}=20\] |
| So, 1 faraday of charge is required. |
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