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प्रश्न
Why does a new aluminium vessel lose shine so soon after use?
उत्तर
Aluminium is highly reactive. It reacts with moist air and forms a thin layer of aluminium oxide on it. This layer fades away the shine of aluminium. Thus, aluminium vessels lose its shine soon after use.
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संबंधित प्रश्न
A zinc ore on heating in air forms sulphur dioxide. Describe briefly any two stages involved in the conversion of this concentrated ore into zinc metal.
Explain giving one example, how highly reactive metals (which are high up in the reactivity series) are extracted.
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:
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.
Arrange the metals of copper, iron, magnesium, sodium and zinc in the decreasing order of reactivity.
choose the most appropriate term to match the given description.
Heating of the ore in the absence of air to high temperature
Write the name.
Metals which are amphoteric in nature.
Explain the following reaction with the balanced equation.
Ferric oxide is reacted with aluminium.
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?
