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प्रश्न
Find the odd one out and give its explanation.
पर्याय
Zinc coating
Tinning
Electroplating
Calcination
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उत्तर
Calcination
Explanation-
Calcination is a process involved in extraction of carbonate ores while others are methods used for prevention of corrosion.
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संबंधित प्रश्न
Metallic oxides of zinc, magnesium and copper were heated with the following metals.
| Metal | Zinc | Magnesium | Copper |
| Zinc oxide | – | – | – |
| Magnesium oxide | – | – | – |
| Copper oxide | – | – | – |
In which cases will you find displacement reactions taking place?
Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.
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.
Describe with one example, how moderately reactive metals (which are in the middle of reactivity series) are extracted.
Explain why, an aqueous solution of sodium chloride is not used for the electrolytic extraction of sodium metal.
The two metals which can be extracted just by heating their sulphides in air are ______.
State why aluminium is extracted from its oxide by electrolysis while copper, lead, iron by reducing agents and mercury and silver by thermal decomposition.
Give reasons, why aluminum is used in:
painting electric and telegraphic poles
Aluminum is used in thermite welding:
what is thermit?
Distinguish between ‘roasting’ and ‘calcination’. Which of these two is used for sulphide ores and why?
Name the anode, the cathode and the electrolyte used in the electrolytic refining of impure copper.
Write equations for each of the above metal which reacts with water.
Name the following :
The Process of heating an ore to a high temperature in the presence of air.
If Cu, Fe, Zn, Al elements are arranged in increasing order of their reactivity then the correct order would be which of the following?
Explain the concept of Roasting.
Explain the following reaction with the balanced equation.
Chlorine dissolved in water
Explain the following reaction with the balanced equation.
Ferric oxide is reacted with aluminium.
Explain Bayer’s process of concentration of bauxite with a chemical equation.
Which of the following metals exist in their native state in nature?
- Cu
- Au
- Zn
- Ag
