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प्रश्न
Bauxite reacts with sodium hydroxide in the Bayer’s process.
विकल्प
Right
Wrong
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उत्तर
Bauxite reacts with sodium hydroxide in the Bayer’s process- Right
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संबंधित प्रश्न
Name the following:
The property possessed by metals by which they can be beaten into sheets.
Write the composition of the alloy called bronze.
Explain why, carbon cannot reduce oxides of sodium or magnesium.
Explain why, an aqueous solution of sodium chloride is not used for the electrolytic extraction of sodium metal.
Which of the following is an iron ore?
(a) cinnabar
(b) calamine
(c) haematite
(d) 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 major ore of aluminium is known as:
(a) cinnabar
(b) calamine
(c) bauxite
(d) pyrolusite
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?
Which metal can be extracted from the following ore?
Haematite
Name the following:
Two metals which are found in the free or native state.
Name the following:
The substance added to get rid of gangue in the extraction of metal.
Compare the process of calcination and roasting.
Write equations for each of the above metal which reacts with water.
Froth floatation process is generally used to concentrate ______ ores.
Zinc sulphide : Roasting : : zinc carbonate : _______
Write the name.
The process of extraction of aluminium from alumina-
Explain the reactions of nonmetals with water with the help of examples.
Explain concept with example/explain with the help of a balanced equation.
Roasting
The highly reactive metals like Sodium, Potassium, Magnesium, etc. are extracted by the ____________.
Care must be taken while diluting concentrated nitric acid with water. Why?
