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प्रश्न
Write the name.
Strongly heating carbonate ores in insufficient air -
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उत्तर
Calcination
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संबंधित प्रश्न
Which metal becomes black in the presence of hydrogen sulphide gas in air?
Name one metal which is extracted by:
Reduction with carbon.
Name one metal which is extracted by:
Reduction with aluminium.
A zinc ore on heating in air forms sulphur dioxide. Describe briefly any two stages involved in the conversion of this concentrated ore into zinc metal.
An important ore of zinc metal is ______.
The major ore of aluminium is known as ______.
Manganese metal is extracted from manganese dioxide by a reduction process by making use of ______.
A sulphide ore is converted into metal oxide by the process of ______.
Some metallic oxides can be reduced by hydrogen, carbon and carbon monoxide and some cannot. Explain.
Distinguish between ‘roasting’ and ‘calcination’. Which of these two is used for sulphide ores and why?
Define the following term.
Gangue
Give the chemical formula of :
Cryolite
Give the chemical formula of :
Sodium aluminate
The following question relate to the extraction of aluminium by electrolysis.
Give the equation for the reaction which takes place at the cathode.
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 :
Metals form non-polar covalent compounds
Which one of the following is not true of metal :
Metal will have 1 or 2 or 3 electrons in their valence shell.
Explain concept with example/explain with the help of a balanced equation.
Roasting
Explain in brief types of extraction of less reactive metals according to their reactivity.
2 mL each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentrated HNO3 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be
