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प्रश्न
_______ is the least reactive metal.
पर्याय
silver
sodium
zinc
gold
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उत्तर
Gold is the least reactive metal.
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संबंधित प्रश्न
Name two metals which occur in nature in free state as well as in combined state.
Give the name of one ore of iron. Which iron compound is present in this ore? Write its chemical formula.
An ore of manganese metal is:
(a) bauxite
(b) haematite
(c) cuprite
(d) pyrolusite
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.
(a) What are A and B?
(b) Identify C and D.
(c) What will be the action of C on litmus solution? Why?
(d) Write formula of the compound formed when element B reacts with an element E having atomic number 5.
Which metal can be extracted from the following ore?
bauxite
Give the principles of electromagnetic separation.
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 ore of mercury. With the help of balanced chemical equations, explain the process of extraction of mercury from its ore.
The following questions relate to the extraction of aluminium by electrolysis.
Explain why it is necessary to renew the anode periodically.
How many valence electrons are present in non- metals?
Draw a well-labelled diagram of extraction of Aluminium. Write the anode reaction in electrolytic reduction of Alumina.
Iron is _______.
In Electrolytic reduction of alumina, Anode : _______ : : Cathode : Graphite lining
Identify who I am!
Ore of Aluminum- ______
Write the molecular formulae of the following compound.
Sodium aluminate
Explain Bayer’s process.
Explain concept with example/explain with the help of a balanced equation.
Calcination
Explain in brief types of extraction of highly reactive metals according to their reactivity.
2 mL each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentrated HNO3 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be
