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प्रश्न
Explain the following reaction with the balanced equation.
Chlorine dissolved in water
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उत्तर
Chlorine dissolves in water to form hypochlorous acid and hydrochloric acid.
\[\ce{\underset{\text{Chlorine}}{Cl_{2(g)}} + \underset{\text{Water}}{H2O_{(l)}} -> \underset{\text{Hypochlorous acid}}{HOCl_{(aq)}} + \underset{\text{Hydrochloric acid}}{HCl_{(aq)}}}\]
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संबंधित प्रश्न
The process by which sulphide ore is concentrated.
In the extraction of aluminium Write the cathode reaction in electrolytic reduction of alumina.
Name two metals which are highly resistant to corrosion.
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 |
Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?
Name one ore of mercury. Which mercury compound is present in this ore? Write its chemical formula.
An ore of manganese metal is:
(a) bauxite
(b) haematite
(c) cuprite
(d) pyrolusite
Which of the following pair of metals exists in their native state in nature?
(a) Ag and Hg
(b) Ag and Zn
(c) Au and Hg
(d) Au and Ag
Give reasons, why aluminum is used in:
wrapping chocolates
Aluminum is used in thermite welding:
what is thermit?
Define the term:
Flux
What is meant by refining of metals? Name the three common methods used for refining.
Arrange the metals of copper, iron, magnesium, sodium and zinc in the decreasing order of reactivity.
Correct the following statement :
Copper reacts with nitric acid to produce nitrogen dioxide.
Sulphide ores : Roasting : : Carbonate ores : _______
Find the odd one out and give its explanation.
Gold and silver are active metals.
Observe the following diagram and write answers.
- Name the method.
- Write anode reaction and cathode reaction.
- Why fluorspar and cryolite are added in the mixture?
Explain in brief types of extraction of moderately reactive metals according to their reactivity.
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.
