Advertisements
Advertisements
Question
Write the molecular formulae of the following compound.
Fluorspar
Solution
Fluorspar- CaF2
APPEARS IN
RELATED QUESTIONS
What chemical process is used for obtaining a metal from its oxide?
How is copper extracted from its sulphide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.
Write the composition of the alloy called bronze.
Name one metal which is extracted by reduction with carbon.
Name one metal which is extracted by reduction with aluminium.
What is the difference between a mineral and an ore?
Which metal is extracted from cinnabar ore?
An important ore of zinc metal is:
(a) calamine
(b) cuprite
(c) pyrolusite
(d) haematite
In an electrolytic tank, aluminium metal is being extracted by the electrolysis of molten aluminium oxide using carbon electrodes. It is observed that one of the carbon electrodes is gradually burnt away and has to be replaced.
(a) Which carbon electrode (cathode or anode) is burnt away?
(b) Why is this carbon electrode burnt away?
Metals X and Y can be recovered from the anode mud left behind after the electrolytic refining of copper metal. The coins made of metal X look new even after several years of use but the coins made of metal Y lose their shine gradually and get blackened soon. When metal X is alloyed with a small amount of metal Y, it becomes hard and hence suitable for making ornaments. What are metals X and Y? Also state the colour of metal X.
Give the principles of the froth floatation process.
Give the chemical formula of :
Sodium aluminate
What is passive iron?
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 _________
In electrolytic reduction of alumina _______ is used as a cathode.
Aluminium oxide is _______ oxide.
Zinc sulphide : Roasting : : zinc carbonate : _______
Explain the following reaction with the balanced equation.
Chlorine dissolved in water
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.
