Multiple choice

How would you differentiate between chalk powder and salt without tasting them?

  1. By dissolving solid in water

  2. By observing the size of particles

  3. By sieving

  4. By heating
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chalk powder is insoluble in water while salt completely dissolves, so adding water to each substance will clearly differentiate them - the chalk powder will remain as a solid residue at the bottom while salt will disappear into the water. Particle size observation and sieving won't work reliably since both can have similar particle sizes, and heating would just evaporate water from salt but leave both as solids.

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