The process of converting bauxite into pure alumina is called:
A. Hall-Héroult process
B. Contact process
C. Ostwald process
D. Bayer's process
Answer: Option D
Solution (By JKSSB Mock Tests)
Bayer's process uses hot NaOH to dissolve alumina from bauxite, leaving behind insoluble impurities (red mud). Alumina is then precipitated. Hall-Héroult is electrolytic reduction of alumina to aluminium.
Explanation:
Ethanol, commonly known as ethyl alcohol, has the chemical formula C₂H₅OH. Methanol is CH₃OH. Acetic acid (ethanoic acid) is CH₃COOH, and propionic acid is C₂H₅COOH. Ethanol is widely used as a solvent, in alcoholic beverages, and as a biofuel.
Explanation:
Plaster of Paris (CaSO₄·½H₂O) reacts with water to form gypsum (CaSO₄·2H₂O) which sets into a hard solid mass with slight expansion. Reaction: CaSO₄·½H₂O + 1½H₂O → CaSO₄·2H₂O. This property is used for casting and setting broken bones.
Explanation:
HCl + NaOH → NaCl + H₂O. This is a neutralization reaction producing sodium chloride (common salt). NaNO₃ from HNO₃, Na₂SO₄ from H₂SO₄, Na₂CO₃ from H₂CO₃ (weak acid).
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