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What is karat?

  1. A unit of weight

  2. A measure of density

  3. A measure of volume

  4. A measure of purity

The correct answer is: A measure of purity

A karat is a unit used to measure the purity of gold, with 24 karats being pure gold. Option A is incorrect because a karat is not a unit of weight, it is a unit of measurement used for purity. Option B is incorrect because a karat does not measure density. Option C is incorrect because a karat does not measure volume. The only correct answer is D, as it correctly identifies karat as a unit of purity.