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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
Name two metals which are found in nature in the free state.
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
Name one metal which is extracted by:
Electrolytic reduction.
Why does aluminium not corrode right through?
Give the name of one ore of iron. Which iron compound is present in this ore? Write its chemical formula.
Calamine ore can be used to extract one of the following metals. This metal is:
Rock salt is an ore of one of the following metals. This metal is:
Some metallic oxides can be reduced by hydrogen, carbon and carbon monoxide and some cannot. Explain.
Give reasons, why aluminum is used in:
painting electric and telegraphic poles
Give reasons, why aluminum is used in:
In aluminiothermy
Give reasons, why aluminum is used in:
In making ships
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?
How an ore is concentrated by froth floatation process?
Compare the properties of a typical metal and a non- metal on the basis of the following:
(a) electronic configuration
(b) nature of oxides
(c) oxidizing or reducing action
(d) conductivity of heat and electricity
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 ______.
Froth floatation process is generally used to concentrate ______ ores.
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.
Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper, etc. are reduced by using:
Which of the statements about the reaction, \[\ce{ZnO + CO -> Zn + CO2}\] is correct?
Care must be taken while diluting concentrated nitric acid with water. Why?
