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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 the gas in air which tarnishes silver articles slowly.
Name one metal which is extracted by:
Reduction with heat alone.
Explain giving one example, how highly reactive metals (which are high up in the reactivity series) are extracted.
Define the term gangue.
Name three other metals which are extracted in a manner similar to sodium.
Explain how, mercury is extracted from its sulphide ore (cinnabar). Give equations of the reactions involved.
The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its ______.
Zinc blende ore can be converted into zinc 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?
Define the term:
Slag
Explain the following:
Galvanization protects iron from rusting.
What is galvanized iron.
Name : The metal which is liquid at room temperature.
Mercury, silver, gold are highly reactive metals.
Explain in brief types of extraction of highly reactive metals according to their reactivity.
Explain in brief types of extraction of moderately reactive metals according to their reactivity.
During extraction of metals, electolytic refining is used to obtain pure metals.
(a) Which material will be used as anode and cathode for refining of silver metal by this process?
(b) Suggest a suitable electrolyte also.
(c) In this electrolytic cell, where do we get pure silver after passing electric current?
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Give a reason why Aluminium is preferably used in thermite reactions.
