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MODEL PAPER - 8 [2026] — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMODEL PAPER - 8 [2026]1 Mark
MCQ
Plaster of Paris hardens by
  • A
    Passing of $\mathrm{CO}_{2}$ gas
  • B
    Changing into $\mathrm{CaCO}_{3}$
  • ✓
    Combining with water
  • D
    Releasing out a molecule of water
✓

Answer

Correct option: C.
Combining with water
(C) Combining with water
Explanation :
When water is added to the Plaster of Paris, it sets into a hard mass due to its hydration to form crystals of gypsum.
$\mathrm{CaSO}_{4} \cdot \frac{1}{4} \mathrm{H}_{2} \mathrm{O}+1 \frac{1}{2} \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}$

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