Neco Model Questions Vol1 2020 Chemistry Question 27
Practice objective / multiple choice question 27 from the 2020 Neco Model Questions Vol1 Chemistry examination.
10.0 g of 2‑methyl‑1‑butanol (\(\mathrm{C_{5}H_{12}O}\)) is oxidised with potassium dichromate in acidic medium according to the overall equation\n\[\n3\,\mathrm{C_{5}H_{12}O} + \mathrm{Cr_{2}O_{7}^{2-}} + 8\,\mathrm{H^{+}} \rightarrow 3\,\mathrm{C_{5}H_{10}O} + 2\,\mathrm{Cr^{3+}} + 4\,\mathrm{H_{2}O}.\n\]\nIf 5.0 g of \(\mathrm{K_{2}Cr_{2}O_{7}}\) is used, determine (a) the theoretical mass of 2‑methylbutanal (\(\mathrm{C_{5}H_{10}O}\)) that can be formed, (b) the percent yield if 4.2 g of the aldehyde is isolated.
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This is Neco Model Questions Vol1 2020 Chemistry Question 27. It is one of the objective questions from the 2020 Neco Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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