Multiple choice

Why do black shoe polishes have an oily feels?

  1. it is a mixture of oil and powdered graphite

  2. when exposed to air it undergoes a chemical change and produces oily substance

  3. vapour of some amount of oil is left over after its preparation

  4. these are formed by dissolving charcoal in oil
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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