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प्रश्न
Name the following:
Main ore of aluminium.
Name the ore for aluminium.
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उत्तर
Bauxite (Al2O3.nH2O) is the main ore of aluminium.
संबंधित प्रश्न
In the extraction of aluminium: Name the process of concentration of bauxite.
What chemical process is used for obtaining a metal from its oxide?
The process by which sulphide ore is concentrated.
How many carats is pure gold? Why is pure gold not suitable for making ornaments?
Why does a new aluminium vessel lose shine so soon after use?
Fill in the following blank with suitable word:
The rocky material found with ores is called.............
Define the term mineral.
Define the terms gangue.
Name one ore of sodium. Name the sodium compound present in this ore and write its chemical formula.
Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae.
An ore of manganese metal is:
(a) bauxite
(b) haematite
(c) cuprite
(d) pyrolusite
Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks?
(a) Al2O3 + Fe
(b) MnO2 + Al
(c) Fe2O3 + Al
(d) Cu2O + Fe
Which of the following metals are extracted by the electrolysis of their molten chlorides?
(a) Na and Hg
(b) Hg and Mg
(c) Na and Mg
(d) Cu and Fe
Rock salt is an ore of one of the following metals. This metal is:
(a) Mn
(b) Na
(c) Fe
(d) Cu
Give the principles of the hydrolytic method.
Some metallic oxides can be reduced by hydrogen, carbon and carbon monoxide and some cannot. Explain.
State why aluminium is extracted from its oxide by electrolysis while copper, lead, iron by reducing agents and mercury and silver by thermal decomposition.
Give reasons, why aluminum is used in:
In making ships
Aluminum is used in thermite welding:
what is thermit?
Aluminum is used in thermite welding:
what is ignition mixture?
Define the term:
Slag
What is galvanized iron.
The following questions relate to the extraction of aluminium by electrolysis.
Explain why it is necessary to renew the anode periodically.
How many valence electrons are present in metals ?
Which one of the following is not true of metal :
Metals are good conductors of electricity.
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 _________
Identify who I am!
Ore of Aluminum- ______
Explain the following reaction with the balanced equation.
Zinc oxide is treated with carbon
Complete flow chart given below.
Explain in brief types of extraction of highly reactive metals according to their reactivity.
Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper, etc. are reduced by using:
Which of the following ore is concentrated by the Froth floatation process?
Which of the following metals exist in their native state in nature?
- Cu
- Au
- Zn
- Ag
Two ores A and B were taken. On heating ore A gives CO2 whereas, ore B gives SO2. What steps will you take to convert them into metals?
Care must be taken while diluting concentrated nitric acid with water. Why?
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.
