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प्रश्न
Zinc sulphide : Roasting : : zinc carbonate : _______
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उत्तर
Zinc sulphide : Roasting : : zinc carbonate : calcination
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संबंधित प्रश्न
In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte?
Name the most abundant metal in the earth's crust.
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
Name two metals which occur in nature in free state as well as in combined state.
Explain giving one example, how highly reactive metals (which are high up in the reactivity series) are extracted.
How is aluminium metal extracted? Explain with the help of an equation.
The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its:
(a) oxide
(b) hydride
(c) sulphide
(d) carbonate
Compare the process of calcination and roasting.
What is meant by refining of metals? Name the three common methods used for refining.
How many valence electrons are present in metals ?
Correct the following statement :
Copper reacts with nitric acid to produce nitrogen dioxide.
choose the most appropriate term to match the given description.
Heating of the ore in the absence of air to high temperature
What is the difference between calcination and roasting?
Aluminium oxide is _______ oxide.
Bauxite reacts with sodium hydroxide in the Bayer’s process.
Explain the following reaction with the balanced equation.
Zinc carbonate is heated strongly in limited supply of air
Explain concept with example/explain with the help of a balanced equation.
Calcination
Which of the following metals exist in their native state in nature?
(i) Cu
(ii) Au
(iii) Zn
(iv) Ag
Give the reaction involved during extraction of zinc from its ore by
- roasting of zinc ore
- calcination of zinc ore
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Identify the substance oxidised and reduced in the above reaction.
