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प्रश्न
Name three other metals which are extracted in a manner similar to sodium.
उत्तर
Potassium, calcium and aluminium are highly reactive metals like sodium and are also placed on the top of the reactivity series. These metals are not reduced by other reducing agents such as coke, carbon monoxide etc. Like sodium, these metals are also extracted by electrolytic reduction of their molten chlorides or oxides.
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संबंधित प्रश्न
Define the term ore.
Name the following:
The process of heating a substance very strongly in such a way that it does not combine with oxygen.
Explain the following:
Galvanization protects iron from rusting.
Complete the incomplete statement with missing words:
Metals are ______ while non-metals are ______ conductors of heat.
Complete the incomplete statement with missing word:
Metals form positive ions while non- metals ______.
Find the odd one out and give its explanation.
Explain the following reaction with the balanced equation.
Sodium aluminate reacts with water
Explain concept with example/explain with the help of a balanced equation.
Roasting
Explain concept with example/explain with the help of a balanced equation.
Calcination
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.
