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प्रश्न
Find the odd one out and give its explanation.
पर्याय
Na
K
Cu
Li
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उत्तर
Cu
Explanation-
Copper (Cu) is a less reactive metal while others are highly reactive metals.
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संबंधित प्रश्न
Why are the metals like Na, K, Ca and Mg never found in their free state in nature?
Name one metal which is extracted by:
Reduction with carbon.
Name one metal which is extracted by:
Reduction with aluminium.
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.
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
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.
Give reasons, why aluminum is used in:
In aluminiothermy
Define the following term.
Mineral
Name the following:
A compound which is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium.
Zinc sulphide : Roasting : : zinc carbonate : _______
Right or wrong sentence?
The electrolysis of alumina combines fluorite and cryolite to increase the solubility in the precipitation method.
Identify who I am!
Ore of Aluminum- ______
Explain the reactions of nonmetals with water with the help of examples.
Explain the following reaction with the balanced equation.
Ferric oxide is reacted with aluminium.
Explain in brief types of extraction of moderately reactive metals according to their reactivity.
Explain Bayer’s process of concentration of bauxite with a chemical equation.
Which of the following metals exist in their native state in nature?
(i) Cu
(ii) Au
(iii) Zn
(iv) Ag
Which of the following metals exist in their native state in nature?
- Cu
- Au
- Zn
- Ag
During extraction of metals, electolytic refining is used to obtain pure metals.
(a) Which material will be used as anode and cathode for refining of silver metal by this process?
(b) Suggest a suitable electrolyte also.
(c) In this electrolytic cell, where do we get pure silver after passing electric current?
