Write the equation for the following reactions.
1.When Zinc oxide dissolves in Sodium hydroxide.
2.Laboratory preparation of Zinc carbonate from Zinc nitrate.
3.Action of Aluminium oxide and Potassium hydroxide.
4.Roasting of Zinc blende.
5.Catalytic oxidation of Ammonia.
Answers
Answer:
1- Zinc oxide react with sodium hydroxide to produce zincate sodium and water. This reaction takes place at a temperature of 500-600°C.
ZnO + 2NaOH → Na2ZnO2 + H2O
2- Zinc carbonate can be made by reacting zinc sulfate or any other water soluble zinc(II) salt with sodium carbonate or sodium bicarbonate. It can also be made by the reaction of zincates with carbon dioxide. The resulting precipitate can then be filtered and dried, then stored in an environment free of acidic vapors.
3- Potassium hydroxide react with aluminum oxide to produce potassium aluminate and water. This reaction takes place at a temperature of 900-1100°C.
2KOH + Al2O3 → 2KAlO2 + H2O
4- Zinc sulphide is converted to Zinc Oxide. ZnO obtained during roasting is mixed with coke and heated strongly where ZnO is reduced to Zn by carbon. The reduction is done in vertical refort. In this process roasted are mixed with coke in the ration of 2:1 and small briquets are made.
5- The catalytic oxidation of ammonia occurs when ammonia and oxygen are combined in the presence of high heat and a catalytic metal. ... The ammonia is then oxidized into nitric oxide. In a separate container, oxygen continues oxidizing the nitric oxide into nitrogen dioxide gas, which is adsorbed by water.
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