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प्रश्न
Name the following:
Main ore of aluminium.
Name the ore for aluminium.
Give one word for the following:
An ore of aluminium.
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उत्तर
Bauxite (Al2O3.nH2O) is the main ore of aluminium.
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संबंधित प्रश्न
M is a metal above hydrogen in the activity series and its oxide has the formula M2O. This oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context, answer the following:
1) What kind of combination exists between M and O?
2)How many electrons are there in the outermost shell of M?
3) Name the group to which M belongs.
4) State the reaction taking place at the cathode.
5) Name the product at the anode.
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
Write the composition of the alloy called bronze.
Explain giving one example, how highly reactive metals (which are high up in the reactivity series) are extracted.
Explain given equation, what happens when ZnCO3 is heated in the absence of air?
How is sodium metal extracted? Explain with the help of equation of the reaction involved.
Name the electrode at which aluminium metal is produced.
Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?
Name the metal which is extracted from the ore called 'rock salt'.
The two metals which can be extracted just by heating their sulphides in air are:
(a) sodium and copper
(b) copper and aluminium
(c) potassium and zinc
(d) mercury and copper
The two metals which are extracted by means of electrolytic reduction of their molten salts are:
(a) magnesium and manganese
(b) iron and aluminium
(c) zinc and magnesium
(d) magnesium and aluminium
The metal which is always present in an amalgam is:
(a) iron
(b) aluminium
(c) mercury
(d) magnesium
Manganese metal is extracted from manganese dioxide by a reduction process by making use of:
(a) carbon
(b) hydrogen
(c) electrolysis
(d) aluminium
The metal which can be extracted simply by heating the cinnabar ore in air is:
(a) Zn
(b) Cu
(c) Al
(d) Hg
During galvanisation, iron metal is given a thin coating of one of the following metals. This metal is:
(a) chromium
(b) tin
(c) zinc
(d) copper
Which metal can be extracted from the following ore?
bauxite
Which metal can be extracted from the following ore?
Calamine
Give the principles of the froth floatation process.
Give reasons, why aluminum is used in:
making alloys
Aluminum is used in thermite welding:
what is ignition mixture?
Distinguish between ‘roasting’ and ‘calcination’. Which of these two is used for sulphide ores and why?
Give the chemical formula of :
Cryolite
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?
Define the term:
Slag
What is meant by concentration of ores?
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
Name the following:
The process of heating an ore to a high temperature in the presence of air.
Which one of the following is not true of metal :
Metals form non-polar covalent compounds
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
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 _________
Aluminium oxide is _______ oxide.
Extraction of moderately reactive elements is done by _______ and _______ method.
In Electrolytic reduction of alumina, Anode : _______ : : Cathode : Graphite lining
In the electrolytic reduction of alumina, the lining of graphite acts as an anode.
Explain the reactions of nonmetals with water with the help of examples.
Explain Bayer’s process of concentration of bauxite with a chemical equation.
Electrical wires have a coating of an insulting material. The material, generally used is
Give the reaction involved during extraction of zinc from its ore by
- roasting of zinc ore
- calcination of zinc ore
Care must be taken while diluting concentrated nitric acid with water. Why?
