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MolSynapse / Question bank / s-Block Elements / Important compounds: NaOH, Na2CO3, NaHCO3, CaO, CaCO3, plaster of Paris
NEET levelSingle correct optionDifficulty 1 of 3sb175

In a blast furnace, quicklime is added mainly to remove silica impurity as

  1. A
  2. B
  3. C
  4. D

Answer: D

is a basic oxide and silica is acidic. They combine at high temperature: . The molten calcium silicate (slag) floats on the molten iron.
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