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MODEL PAPER - 3 [2026] — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMODEL PAPER - 3 [2026]1 Mark
MCQ
During smelting, an additional substance is added which combines with impurities to form a fusible product known as:

Image
  • A
    Mud
  • B
    Gangue
  • C
    Flux
  • ✓
    Slag
✓

Answer

Correct option: D.
Slag
(D) Slag
Explanation:During the smelting of iron, limestone is added as a flux. The temperature inside the blast furnace decomposes limestone to calcium oxide which removes silicate impurity. Impurities like silicon are passed into the slag. The metal is separated from the molten slag.
$\mathrm{CaCO}_{3} \rightarrow \mathrm{CaO}+\mathrm{CO}_{2}$
$\mathrm{CaO}+\mathrm{SiO}_{2} \rightarrow \mathrm{CaSiO}_{3}$ (Slag)

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