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प्रश्न
Mercury, silver, gold are highly reactive metals.
पर्याय
Right
Wrong
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उत्तर
Mercury, silver, gold are highly reactive metals- Wrong
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संबंधित प्रश्न
The process by which sulphide ore is concentrated.
In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.
Name a reducing agent that may be used to obtain manganese from manganese dioxide.
Give two uses of bronze.
Why does a new aluminium vessel lose shine so soon after use?
Explain why, an aqueous solution of sodium chloride is not used for the electrolytic extraction of sodium metal.
Name the gas evolved when cinnabar ore is roasted.
Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?
Name the metal which is extracted from the ore called ‘rock salt’.
Calamine ore can be converted into zinc oxide by the process of ______.
An element A which is a part of common salt and kept under kerosene reacts with another element B of atomic number 17 to give a product C. When an aqueous solution of product C is electrolysed then a compound D is formed and two gases are liberated.
- What are A and B?
- Identify C and D.
- What will be the action of C on litmus solution? Why?
- State whether element B is a solid, liquid or gas at room temperature.
- Write formula of the compound formed when element B reacts with an element E having atomic number 5.
State three objectives achieved during the roasting of ores.
Name the methods by which concentrated ore is converted to metallic oxide.
Find the odd one out and give its explanation.
Bauxite reacts with sodium hydroxide in the Bayer’s process.
Explain the following reaction with the balanced equation.
Chlorine dissolved in water
Explain concept with example/explain with the help of a balanced equation.
Calcination
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?
On the basis of reactivity metals are grouped into three categories:
- Metals of low reactivity
- Metals of medium reactivity
- Metals of high reactivity
Therefore metals are extracted in pure form from their ores on the basis of their chemical properties.
Metals of high reactivity are extracted from their ores by electrolysis of the molten ore.
Metals of low reactivity are extracted from their sulphide ores, which are converted into their oxides. The oxides of these metals are reduced to metals by simple heating.
(a) Name the process of reduction used for a metal that gives vigorous reaction with air and water both.
(b) Carbon cannot be used as a reducing agent to obtain aluminium from its oxide? Why?
(c) Describe briefly the method to obtain mercury from cinnabar. Write the chemical equation for the reactions involved in the process.
OR
(c) Differentiate between roasting and calcination giving chemical equation for each.
