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प्रश्न
Write the name.
The process of strong heating of carbonate ores in insufficient air–
उत्तर
The process of strong heating of carbonate ores in insufficient air– Calcination
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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.
Define the terms gangue.
Explain given equation, what happens when ZnCO3 is heated in the absence of air?
Name two metals which are always found in combined state.
Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?
Name one ore of mercury. Which mercury compound is present in this ore? Write its chemical formula.
Which of the following pair of metals exists in their native state in nature?
(a) Ag and Hg
(b) Ag and Zn
(c) Au and Hg
(d) Au and Ag
Manganese metal is extracted from manganese dioxide by a reduction process by making use of:
(a) carbon
(b) hydrogen
(c) electrolysis
(d) aluminium
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.
Aluminum is used in thermite welding:
what is thermit?
Name the following:
A compound which is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium.
Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as ______.
Define calcination.
Answer the following question:
Carbon cannot reduce the oxides of sodium, magnesium, and aluminum to their respective metals. Why? Where are these metals placed in the reactivity series? How are these metals obtained from their ores? Take an example to explain the process of extraction along with chemical equations.
Sulphide ores : Roasting : : Carbonate ores : _______
Explain the reactions of nonmetals with water with the help of examples.
Explain the characteristics of ionic compounds.
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.
The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called ____________.
