Advertisements
Advertisements
Questions
In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.
In the extraction of aluminium Write the function and chemical formula of cryolite
Solution
Cryolite is added to the molten mixture of alumina to reduce the melting point. The formula of cryolite is Na3AlF6.
APPEARS IN
RELATED QUESTIONS
In the extraction of aluminium: Name the process of concentration of bauxite.
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?
Define the term ore.
Name the gas produced when calamine ore is calcined.
What is the difference between a mineral and an ore?
The metal which is always present in an amalgam is:
(a) iron
(b) aluminium
(c) mercury
(d) magnesium
Give reasons, why aluminum is used in:
making alloys
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Name the electrode, from which aluminium collected.
Name the following:
Two metals which are found in the free or native state.
How are metals refined by the electrolytic methods?
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.
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 _________
Answer the following question:
Carbon cannot reduce the oxides of sodium, magnesium, and aluminum to their respective metals. Why? Where are these metals placed in the reactivity series? How are these metals obtained from their ores? Take an example to explain the process of extraction along with chemical equations.
Explain the following reaction with the balanced equation.
Chlorine dissolved in water
Explain the following reaction with the balanced equation.
Ferric oxide is reacted with aluminium.
Explain concept with example/explain with the help of a balanced equation.
Calcination
Explain the difference between Bayer’s process and Hall’s process by explaining the Bayer’s process.
During extraction of metals, electolytic refining is used to obtain pure metals.
(a) Which material will be used as anode and cathode for refining of silver metal by this process?
(b) Suggest a suitable electrolyte also.
(c) In this electrolytic cell, where do we get pure silver after passing electric current?
A mineral from which the metal can be extracted economically and conveniently is known as ______.
