alleryColoured chalk sticks are made from the dihydrate form of which compound?
AAluminium oxide
BCalcium carbonate
CSodium carbonate
DCalcium sulphate
Answer & Solution
Correct answer: D. Calcium sulphate
1. White chalk uses calcium carbonate.
2. Coloured sticks use CaSO4·2H2O, derived from gypsum.
3. So calcium carbonate is the white-chalk answer, not this one.
_Source: Wikipedia, Blackboard, Chalk sticks_
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