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प्रश्न
Give the chemical formula of :
Sodium aluminate
उत्तर
Sodium aluminate: NaAlO2
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संबंधित प्रश्न
Metals X and Y can be recovered from the anode mud left behind after the electrolytic refining of copper metal. The coins made of metal X look new even after several years of use but the coins made of metal Y lose their shine gradually and get blackened soon. When metal X is alloyed with a small amount of metal Y, it becomes hard and hence suitable for making ornaments. What are metals X and Y? Also state the colour of metal X.
State three objectives achieved during the roasting of ores.
Give reasons, why aluminum is used in:
making alloys
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Why is powdered coke sprinkled on top of the electrolyte?
Write equations for each of the above metal which reacts with water.
Complete the incomplete statement with missing word:
Metals are malleable while non-metals are ______.
Write the molecular formulae of the following compound.
Sodium aluminate
Explain the following reaction with the balanced equation.
Zinc oxide is treated with carbon
Explain the difference between Bayer’s process and Hall’s process by explaining the Bayer’s process.
On the basis of reactivity metals are grouped into three categories:
- Metals of low reactivity
- Metals of medium reactivity
- Metals of high reactivity
Therefore metals are extracted in pure form from their ores on the basis of their chemical properties.
Metals of high reactivity are extracted from their ores by electrolysis of the molten ore.
Metals of low reactivity are extracted from their sulphide ores, which are converted into their oxides. The oxides of these metals are reduced to metals by simple heating.
(a) Name the process of reduction used for a metal that gives vigorous reaction with air and water both.
(b) Carbon cannot be used as a reducing agent to obtain aluminium from its oxide? Why?
(c) Describe briefly the method to obtain mercury from cinnabar. Write the chemical equation for the reactions involved in the process.
OR
(c) Differentiate between roasting and calcination giving chemical equation for each.
