Advertisements
Advertisements
Questions
Name the following:
Main ore of aluminium.
Name the ore for aluminium.
Give one word for the following:
An ore of aluminium.
Advertisements
Solution
Bauxite (Al2O3.nH2O) is the main ore of aluminium.
APPEARS IN
RELATED QUESTIONS
Name two metals which are found in nature in the free state.
What chemical process is used for obtaining a metal from its oxide?
Metallic oxides of zinc, magnesium and copper were heated with the following metals.
| Metal | Zinc | Magnesium | Copper |
| Zinc oxide | – | – | – |
| Magnesium oxide | – | – | – |
| Copper oxide | – | – | – |
In which cases will you find displacement reactions taking place?
Give a reasons for the following:
Carbonate and sulphide ores are usually converted into oxides during the process of extraction of metals.
A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset, but after a futile argument, the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?
In the extraction of aluminium: Why is it necessary to replace anodes time to time?
Write the composition of the alloy called bronze.
Name two metals which are highly resistant to corrosion.
Explain why, carbon cannot reduce oxides of sodium or magnesium.
Why are the metals like Na, K, Ca and Mg never found in their free state in nature?
Name one metal which is extracted by:
Electrolytic reduction.
Why does aluminium not corrode right through?
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.
Name three other metals which are extracted in a manner similar to sodium.
Which of the following is an ore of mercury metal?
Calamine ore can be used to extract one of the following metals. This metal is:
Which of the following metals can be obtained from haematite ore?
The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its ______.
The metal which can be extracted from pyrolusite ore is ______.
Give the chemical formula of :
Sodium aluminate
Name the following:
The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.
Compare the properties of a typical metal and a non- metal on the basis of the following:
(a) electronic configuration
(b) nature of oxides
(c) oxidizing or reducing action
(d) conductivity of heat and electricity
Calcium, copper, lead, aluminium, zinc, chromium, magnesium, iron.
Choose the major metals from the list given above to make the following alloys:
(a) Stainless steel
(b) brass
Which one of the following is not true of metal :
Metal will have 1 or 2 or 3 electrons in their valence shell.
Answer the following question :
What is the difference between calcination and roasting.
Complete the following by selecting the correct option from the choices given:
The metal which does not react with water or dilute H2SO4 but reacts with concentrated H2SO4 is _________
choose the most appropriate term to match the given description.
Heating of the ore in the absence of air to high temperature
Name the process used for the enrichment of sulphide ore.
Iron is _______.
Write the name.
The molecular formula of main ore of aluminium -
Right or wrong sentence?
The electrolysis of alumina combines fluorite and cryolite to increase the solubility in the precipitation method.
Bauxite reacts with sodium hydroxide in the Bayer’s process.
Explain the reactions of nonmetals with water with the help of examples.
Explain the characteristics of ionic compounds.
Explain the following reaction with the balanced equation.
Chlorine dissolved in water
Complete flow chart given below.

Explain in brief types of extraction of moderately 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?
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.
