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प्रश्न
Explain the following reaction with the balanced equation.
Sodium aluminate reacts with water
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उत्तर
Sodium aluminate reacts with water to give aluminium hydroxide as a precipitate and sodium hydroxide.
\[\ce{\underset{\text{Sodium aluminate}}{NaAlO_{2(aq)}} + \underset{\text{Water}}{2H2O_{(l)}} -> \underset{\text{Sodium hydroxide}}{NaOH_{(aq)}} + \underset{\text{Aluminium hydroxide}}{Al(OH)_3↓}}\]
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संबंधित प्रश्न
Name two metals which are found in nature in the free state.
Metallic oxides of zinc, magnesium and copper were heated with the following metals.
| Metal | Zinc | Magnesium | Copper |
| Zinc oxide | – | – | – |
| Magnesium oxide | – | – | – |
| Copper oxide | – | – | – |
In which cases will you find displacement reactions taking place?
The non-metal present in steel is ______.
Which one of the methods given in column I is applied for the extraction of each of the metals given in column II:
| Column I | Column II |
| Electrolytic reduction | Aluminium |
| Reduction with Carbon | Zinc |
| Reduction with Aluminium | Sodium |
| Iron | |
| Manganese | |
| Tin |
Name the gas produced when calamine ore is calcined.
Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?
Describe the extraction of zinc metal from its sulphide ore (zinc blende). Write equations of the reactions involved.
During galvanisation, iron metal is given a thin coating of one of the following metals. This metal is:
Which of the following metals are extracted by the electrolysis of their molten chlorides?
A sulphide ore is converted into metal oxide by the process of ______.
A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air.
- Name the metal and write its chemical symbol.
- Write the name and formula of the sulphide ore.
- Give the equations of chemical reactions involved in the production of metal from its sulphide ore.
- Name a common device in which this metal is used.
- Can this metal displace copper from copper sulphate solution? Why?
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
What is the function of cryolite used along with alumina as the electrolyte?
Name the following:
The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.
Compare the process of calcination and roasting.
What is meant by refining of metals?
Froth floatation process is generally used to concentrate ______ ores.
Iron is _______.
Explain in brief electrolytic reduction of alumina with a neat labelled diagram.
An alloy is
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.
