The extraction of zinc from zinc blende involves roasting to convert it to:
A. ZnSO₄
B. ZnO
C. ZnCl₂
D. Zn metal directly
Answer: Option B
Solution (By JKExamLibrary)
Roasting: 2ZnS + 3O₂ → 2ZnO + 2SO₂. The oxide is then reduced with coke at high temperature: ZnO + C → Zn + CO. Alternatively, it can be leached with H₂SO₄ and electrolyzed.
Explanation:
Concentrated sulfuric acid (H₂SO₄) has a very strong affinity for water and is widely used as a dehydrating agent in laboratories. It can remove water molecules from compounds, such as converting sugar (carbohydrate) to carbon, and is used to dry gases that do not react with it.
Explanation:
Azotobacter is a free-living aerobic bacterium that fixes atmospheric nitrogen in the soil, making it available to non-leguminous crops. Rhizobium is symbiotic and specific to legumes. Nitrobacter and Nitrosomonas are involved in nitrification (converting ammonia to nitrites/nitrates), not nitrogen fixation.
Explanation:
Ammonia (NH₃) is manufactured by the Haber process, which involves the direct combination of nitrogen and hydrogen gases at high pressure (200 atm) and moderate temperature (450°C) in the presence of an iron catalyst. The Contact process is for sulfuric acid, and Ostwald's is for nitric acid.
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