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प्रश्न
Explain the concept of Calcination.
उत्तर
In the calcination process, carbonate ores are strongly heated in a limited supply of air to transform them into oxides. In this process, carbonate ores decompose to form a metal oxide and carbon dioxide gas.
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संबंधित प्रश्न
Name the most abundant metal in the earth's crust.
Name a reducing agent that may be used to obtain manganese from manganese dioxide.
Why does a new aluminium vessel lose shine so soon after use?
Which one of the methods given in column I is applied for the extraction of each of the metals given in column II:
| Column I | Column II |
| Electrolytic reduction | Aluminium |
| Reduction with Carbon | Zinc |
| Reduction with Aluminium | Sodium |
| Iron | |
| Manganese | |
| Tin |
Name the chemical compound which is electrolysed in molten state to obtain aluminium metal. Which gas is evolved during this process?
Name two metals which are always found in combined state.
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
A black metal oxide XO2 is used as a catalyst in the preparation of oxygen gas from potassium chlorate. The oxide XO2 is also used in ordinary dry cells. The metal oxide XO2 cannot be reduced satisfactorily with carbon to form metal X.
(a) Name the metal X.
(b) Name the metal oxide XO2.
(c) Which reducing agent can be used to reduce XO2 to obtain metal X?
(d) Name another metal which can also be extracted by the reduction of its oxide with the above reducing agent.
Which metal can be extracted from the following ore?
bauxite
Give reasons, why aluminum is used in:
making alloys
Name the following:
The mixture of materials fed into a furnace to extract a metal.
Name the following:
The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.
How an ore is concentrated by froth floatation process?
How are metals refined by the electrolytic methods?
What is the difference between calcination and roasting?
Observe the given figure of reactivity series of metals and answer the following questions:
Reactivity series of metals
- Name two metals which react with water.
- Name two moderately reactive metals.
- Name the most highly reactive metal and the most less reactive metal.
Write the name.
Metals which are amphoteric in nature.
Explain the reactions of nonmetals with water with the help of examples.
Explain the following reaction with the balanced equation.
Chlorine dissolved in water
Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper, etc. are reduced by using:
