Chemistry PYQ 7 of 291 · Basic Concepts

An example of physical change

  1. ABlackening of silverware
  2. BBurning of candle
  3. CMaking of curd from milk
  4. DDissolving of sugar in water

38th BPSC Prelims 1992

Show answer and explanation

Correct answer: (d) Dissolving of sugar in water

Explanation

A physical change alters a substance's state, shape or size without making a new substance, and it is usually reversible.

Dissolving sugar in water is physical: evaporating the water gives the sugar back. Silverware blackening (silver sulphide forms), a candle burning and milk turning into curd all make new substances, so they are chemical changes.

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