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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

Although carbon and hydrogen are better reducing agents but they are not used to reduce metallic oxides at high temperatures. Why?

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प्रश्न

Although carbon and hydrogen are better reducing agents but they are not used to reduce metallic oxides at high temperatures. Why?

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उत्तर

It is because at high temperature carbon and hydrogen react with metals to form carbides and hydrides respectively.

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पाठ 6: General Principle and Processes of Isolation of Elements - Multiple Choice Questions (Type - I) [पृष्ठ ८२]

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एनसीईआरटी एक्झांप्लर Chemistry Exemplar [English] Class 12
पाठ 6 General Principle and Processes of Isolation of Elements
Multiple Choice Questions (Type - I) | Q 32 | पृष्ठ ८२

संबंधित प्रश्‍न

What is the chemical composition of malachite?

  1. CuO . CuC03
  2. Cu(OH)2 CuC03
  3. CuO.Cu(OH)2         
  4. Cu2O . Cu(OH)2

Out of C and CO, which is a better reducing agent at the lower temperature range in the blast furnace to extract iron from the oxide ore?


What is the role of CO in the extraction of Iron?


Define Leaching.


Why does copper obtained in the extraction from copper pyrites have a blistered appearance?


A current liberates 0.50 g of hydrogen in 2 hours. The weight of copper (at. wt. = 63.5) deposited at the same time by the same current through copper sulphate solution is ______.


What happens when a nickel rod is dipped into a copper sulphate solution? Justify your answer.

[\[\ce{E{^{\circ}_{Ni^{+2}/Ni}}}\] = − 0.25 V and \[\ce{E{^{\circ}_{Cu^{+2}/Cu}}}\] = +0.34 V]


Metals which occur in their native state in nature:


Which among the following statement is correct?


The most abundant metal on earth is:


Carbonate ore of iron is ____________.


Write the chemical reactions involved in the extraction of gold by cyanide process. Also give the role of zinc in the extraction.


Identify a mineral for the major source of boron from the following list?


When a strip of metallic zinc is placed in an aqueous solution of copper nitrate the blue colour of the solution disappear due to formation of


In the thermite process, the reducing agent is:


Which of the following is not ore of aluminium?


Which of the following is not an ore of magnesiuim? 


Pyrolusite is ______.


Match List - I with List - II.

  List - I   List - II
  (One)   (Composition)
(A) Siderite (I) FeCO3
(B) Malachite (II) CuCO3 · Cu(OH)2
(C) Sphalerite (III) ZnS
(D) Calamine (IV) ZnCO3

Choose the correct answer from the options given below:


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