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प्रश्न
What is meant by the 'concentration of ore'?
उत्तर
An ore usually contains some undesired impurities like sand, mud, rocky substances etc. that are present with the metal. These impurities are called gangue. These impurities are required to be removed before extracting the metal from its ore. Several physical and chemical methods are used to remove these gangue substances from the ore. This process of removing gangue substances from the ore to enhance the concentration (percentage) of metal is called the concentration of the ore.
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संबंधित प्रश्न
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?
Name the gas in air which tarnishes silver articles slowly.
An important ore of zinc metal is:
(a) calamine
(b) cuprite
(c) pyrolusite
(d) haematite
The major ore of aluminium is known as:
(a) cinnabar
(b) calamine
(c) bauxite
(d) pyrolusite
The metal which can be extracted simply by heating the cinnabar ore in air is:
(a) Zn
(b) Cu
(c) Al
(d) Hg
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?
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Name the electrode, from which aluminium collected.
Write equations for each of the above metal which reacts with water.
Name the following:
A steel grey coloured solid non-metal.
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Identify the substance oxidised and reduced in the above reaction.
