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प्रश्न
Explain the following reaction with the balanced equation.
Dry aluminium hydroxide is ignited at 1000 °C
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उत्तर
When dry aluminium hydroxide is calcined by at 1000 °C, pure aluminium oxide, called alumina is obtained.
\[\ce{\underset{\text{Aluminium hydroxide}}{2Al(OH)_{3(s)}} ->[heat][1000 °C] \underset{\text{Aluminium oxide}}{Al2O_{3(s)}} + \underset{\text{Water vapour}}{3H2O_{(g)}}}\]
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संबंधित प्रश्न
M is a metal above hydrogen in the activity series and its oxide has the formula M2O. This oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context, answer the following:
1) What kind of combination exists between M and O?
2)How many electrons are there in the outermost shell of M?
3) Name the group to which M belongs.
4) State the reaction taking place at the cathode.
5) Name the product at the anode.
Name the gas in air which tarnishes silver articles slowly.
Write the composition of the alloy called bronze.
Name the gas produced when calamine ore is calcined.
Name one ore of sodium. Name the sodium compound present in this ore and write its chemical formula.
Name three other metals which are extracted in a manner similar to sodium.
How is copper extracted from its sulphide ore (copper glance), Cu2S? Explain with equations of the reactions involved.
A sulphide ore is converted into metal oxide by the process of ______.
Which metal can be extracted from the following ore?
bauxite
Which metal can be extracted from the following ore?
Haematite
Name the following:
The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.
How many valence electrons are present in metals ?
Name the following:
A compound which is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium.
Which one of the following is not true of metal :
Metals form non-polar covalent compounds
Observe the given figure of reactivity series of metals and answer the following questions:
Reactivity series of metals
- Name two metals which react with water.
- Name two moderately reactive metals.
- Name the most highly reactive metal and the most less reactive metal.
_______ is the least reactive metal.
Mercury, silver, gold are highly reactive metals.
Bauxite reacts with sodium hydroxide in the Bayer’s process.
Explain the following reaction with the balanced equation.
Zinc oxide is treated with carbon
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?
