Rectified spirit is:
Correct answer: B. 95% ethanol
- A. 100% ethanol
- B. 95% ethanol
- C. 90% ethanol
- D. 35% ethanol
Explanation
Rectified spirit, also known as neutral spirits, is a high-purity ethanol solution that has undergone multiple distillation processes known as rectification to reach a concentration of 95% ethanol and 5% water. This specific ratio allows it to be used effectively in applications requiring high-purity alcohol. Option A (100% ethanol) is incorrect because absolute ethanol does not contain any water, making it distinct from rectified spirit. Option C (90% ethanol) contains more water than rectified spirit, altering its properties and uses. Option D (35% ethanol) is far too diluted and is not used in contexts where rectified spirit is required.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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About Alcohols
Alcohols contain a hydroxyl group attached to a saturated carbon atom and are classified as primary, secondary or tertiary. Their nomenclature, hydrogen bonding, acidity, oxidation, dehydration, reaction with sodium and conversion to haloalkanes are covered, along with the distinction between alcohols and phenols, where the hydroxyl group is attached directly to an aromatic ring.
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