Advertisements
Advertisements
प्रश्न
Bauxite reacts with sodium hydroxide in the Bayer’s process.
विकल्प
Right
Wrong
Advertisements
उत्तर
Bauxite reacts with sodium hydroxide in the Bayer’s process- Right
APPEARS IN
संबंधित प्रश्न
Define the Ore.
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.
In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
Which metal becomes black in the presence of hydrogen sulphide gas in air?
Fill in the following blank with suitable word:
The rocky material found with ores is called.............
The metal which can be extracted from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
Give reasons, why aluminum is used in:
In making ships
Name the following:
The substance added to get rid of gangue in the extraction of metal.
Name the following:
Name two metals always find in combined state.
Define the term:
Flux
Name a non- metal that has a metallic luster and sublimes on heating.
Which one of the following is not true of metal :
Metals are good conductors of electricity.
Name the following :
The Process of heating an ore to a high temperature in the presence of air.
Atomic number of aluminium is _______ and its electronic configuration is _______.
Write the name.
The molecular formula of main ore of aluminium –
Write the molecular formulae of the following compound.
Sodium aluminate
Explain in brief types of extraction of highly reactive metals according to their reactivity.
Answer the questions on the following passage.
The minerals from which the metal can be separated economically are called ores. Ores contain many types of impurities such as soil, sand and rocky substances along with metal compounds. These impurities are called gangue.
Metals can be extracted from their ores by means of various methods of separation. The process of extraction of metal in a pure state from the ores is also a part of metallurgy.
Ores are taken out from the mines and the gangue is usually separated from the ore at the site itself by various methods. Then the ores are carried out to the place where metals are produced. Here metals are extracted in pure form. Then metals are further purified by different methods of purification. This entire process is called metallurgy. Most metals being reactive do not occur in nature in the free state but are found in combined state as their salts such as oxides, carbonates, sulphides, and nitrates. however, the most unreactive metals that are not affected by air, water and other natural factors like silver, gold, platinum, generally occur in a free state. The compounds of metals that occur in nature along with the impurities are called minerals.
- What are ores?
- Which processes are involved in the branch of metallurgy? What is metallurgy?
- Which metals are found in a free state?
- In what forms are metals found in combined state?
- What is gangue?
Which of the statements about the reaction, \[\ce{ZnO + CO -> Zn + CO2}\] is correct?
