50 mL of I M oxalic acid is shaken with 0.5 g of wood charcoal. The final concentration of the solution after adsorption is 0.5 M. Amount of oxalic acid absorbed pergram of charcoal is

# 50 mL of I M oxalic acid is shaken with 0.5 g of wood charcoal. The final concentration of the solution after adsorption is 0.5 M. Amount of oxalic acid absorbed pergram of charcoal is

1. A

3.45 g

2. B

3. 15 g

3. C

6.30 g

4. D

None of these

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### Solution:

$W=\frac{126×1×50}{1000}⇒6.3$

(Molecular weight of oxalic acid :163)

$0.5\mathrm{g}\to \frac{6.3}{2}$

$\mathrm{lg}\to \frac{6.3}{2×0.5}×1⇒6.3\mathrm{g}$

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