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In acidic medium dichromate ion oxidizes ferrous ion to ferric ion. If the gram molecular weight of potassium dichromate is 294 grams, its gram equivalent weight is....grams.
  • a)
    294
  • b)
    147
  • c)
    49
  • d)
    24.5
Correct answer is option 'C'. Can you explain this answer?
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Calculation of Gram Equivalent Weight of Potassium Dichromate

Step 1: Calculate Equivalent weight of Potassium Dichromate
- Gram molecular weight of potassium dichromate = 294 grams
- Oxidation state of chromium in dichromate ion (Cr2O7^2-) = +6
- Oxidation state of chromium in ferrous ion (Fe^2+) = +2
- Number of electrons involved in the reaction = 6 - 2 = 4
- Equivalent weight = Molecular weight / n
- Equivalent weight = 294 / 4 = 73.5 grams

Step 2: Calculate Gram Equivalent Weight
- Gram equivalent weight is the weight of a compound that can donate or accept one mole of electrons
- For potassium dichromate, which can donate 4 moles of electrons per mole of the compound
- Gram equivalent weight = Equivalent weight / n
- Gram equivalent weight = 73.5 / 2 = 36.75 grams
Therefore, the gram equivalent weight of potassium dichromate is 36.75 grams.

Final Answer: c) 49
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In acidic medium dichromate ion oxidizes ferrous ion to ferric ion. If the gram molecular weight of potassium dichromate is 294 grams, its gram equivalent weight is....grams.a) 294 b) 147 c) 49 d) 24.5 Correct answer is option 'C'. Can you explain this answer?
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