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प्रश्न
Explain the following reaction with the balanced equation.
Chlorine dissolved in water
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
In the extraction of aluminium Write the cathode reaction in electrolytic reduction of alumina.
Fill in the following blank with suitable word:
The rocky material found with ores is called.............
Why does aluminium not corrode right through?
Name one ore of copper (other than cuprite). Which compound of copper is present in this ore? Also, write its chemical formula.
Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?
Explain how, mercury is extracted from its sulphide ore (cinnabar). Give equations of the reactions involved.
The two metals which can be extracted just by heating their sulphides in air are:
(a) sodium and copper
(b) copper and aluminium
(c) potassium and zinc
(d) mercury and copper
The major ore of aluminium is known as:
(a) cinnabar
(b) calamine
(c) bauxite
(d) pyrolusite
Calamine ore can be used to extract one of the following metals. This metal is:
(a) copper
(b) mercury
(c) aluminium
(d) zinc
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
In an electrolytic tank, aluminium metal is being extracted by the electrolysis of molten aluminium oxide using carbon electrodes. It is observed that one of the carbon electrodes is gradually burnt away and has to be replaced.
(a) Which carbon electrode (cathode or anode) is burnt away?
(b) Why is this carbon electrode burnt away?
Give reasons, why aluminum is used in:
wrapping chocolates
Give reasons, why aluminum is used in:
painting electric and telegraphic poles
The following question relate to the extraction of aluminium by electrolysis.
Give the equation for the reaction which takes place at the cathode.
Write the name.
The molecular formula of main ore of aluminium –
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
Gold and silver are active metals.
Explain the following reaction with the balanced equation.
Dry aluminium hydroxide is ignited at 1000 °C
Complete flow chart given below.
Assertion (A): The extraction of metals from their sulphide ores cannot take place without roasting the ore.
Reason (R): Roasting converts sulphide ores directly into metals.
