Advertisements
Advertisements
Question
In the extraction of aluminium: Name the process of concentration of bauxite.
Solution
The process of concentration of bauxite is known as Bayer’s process.
APPEARS IN
RELATED QUESTIONS
Explain why, carbon cannot reduce oxides of sodium or magnesium.
Name one metal which is extracted by reduction with carbon.
Name the gas produced when calamine ore is calcined.
Name three other metals which are extracted in a manner similar to sodium.
Which metal is extracted from calamine ore?
Calamine ore can be used to extract one of the following metals. This metal is:
(a) copper
(b) mercury
(c) aluminium
(d) zinc
An element A which is a part of common salt and kept under kerosene reacts with another element B of atomic number 17 to give a product C. When an aqueous solution of product C is electrolysed then a compound D is formed and two gases are liberated.
(a) What are A and B?
(b) Identify C and D.
(c) What will be the action of C on litmus solution? Why?
(d) Write formula of the compound formed when element B reacts with an element E having atomic number 5.
Identify the process given in following passage and draw neat labelled diagram showing the process.
Electrolysis of molten mixture of alumina (melting point > 20000C) is done in a steel tank. The tank has a graphite lining on the inner side. This lining does the work of a cathode. A set of graphite rods dipped in the molten electrolyte works as anode. Cryolite (Na3AlF6) and fluorspar (CaF2) are added in the mixture to lower its melting point upto 10000C.
Give the chemical formula of :
Bauxite
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Why is powdered coke sprinkled on top of the electrolyte?
Complete the incomplete statement with missing word:
Metals are malleable while non-metals are ______.
X is an element in the form of a powder. X burns in oxygen and the product is soluble in water. The solution is tested with litmus. Write down only the word which will correctly complete each of the following sentences:
(a) If X is a metal, then the litmus will turn ______.
(b) If X is a non-metal, then the litmus will turn ______.
(c) If X is a reactive metal, then ______ will be evolved, when X reacts with dilute sulphuric acid.
(d) If X is a non -metal, it will form _ oxide, which will form ______ solution with water.
(e) If X is a non -metal, it will not conduct electricity unless it is carbon in the form of ______.
Arrange the metals of copper, iron, magnesium, sodium and zinc in the decreasing order of reactivity.
Which one of the following is not true of metal :
Metals form non-polar covalent compounds
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 _________
Atomic number of aluminium is _______ and its electronic configuration is _______.
Extraction of moderately reactive elements is done by _______ and _______ method.
Explain concept with example/explain with the help of a balanced equation.
Ionic bond and ionic compounds
Observe the figure and answer the following.
- Write the name of the method.
- What is used as anode and cathode in this method?
- Write the molecular formula and use of cryolite.
- Write anode reaction.
- Write cathode reaction.
Assertion (A): The extraction of metals from their sulphide ores cannot take place without roasting the ore.
Reason (R): Roasting converts sulphide ores directly into metals.
