Multiple choice

When pressure is removed from a saturated solution of common salt, it is observed that

  1. the temperature of water increases and the solution becomes supersaturated

  2. the salt sublimes and changes into gaseous state

  3. water solidifies to form ice salt crystals

  4. water rapidly evaporates, leaving behind dry salt

  5. water evaporates along with the salt, leaving a vacuum
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When pressure is reduced, liquid changes to gaseous state. The water in the saturated solution becomes vapour, leaving solid salt behind. This is called vacuum drying.

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