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In calcination, ore is heated with absen...

In calcination, ore is heated with absence of air

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In calcination, ore is heated strongly in the absence of air

Assertion: Durig calcination the ore is heated well below its melting point in the limited supply of air or absence of air. Reason: The process of calcination is carried out for sulphide ores.

Assertion: Roasting is a process in which the ore is heated in presence of air Reason: Concentration of sulphide ore is done by calcination

Figure shows the path of a projectile thrown near the surface of earth in the absence of air resistance. If the air resistances is taken into consideration , then

In the stages involved in the extraction of metals in general - give reasons for following Roasting of the concentrated ore is carried out in the presence of excess air, while calcination of the concentrated ore in the absence or limited supply of air.

From the list of term given, choose the most appropriate term to match the given desciption : [clacination, roasting, pulverisation, emrlting] - (i) Crushing of the ore into a fine powder. (ii) Heating of the ore in the absence of air to a high temperature.

What happens when (a) ZnCO_(3) is heated in the absence of oxygen? (b) a mixture of Cu_(2)O" and "Cu_(2)S is heated?

From the list of terms given, choose the most appropriate term to match the given description. (calcination, roasting, pulverisation, smelting) 1. Crushing of the ore into a fine powder. 2. Heating of the ore in the absence of air to a high temperature.

Consider the following metallurgical processes : (1) Heating impure metal with CO and distilling the resulting volatile carbonyl (BP 43^@ C) and finally decomposing at 150^@C to 230^@ C to get pure metal. (2) Heating the sulphide ore in air until a part is converted to oxide and then further heating in the absence of air to let the oxide react with unchanged sulphide. (3) Electrolysing the molten electrolyte containing CaCl_(2) to obtain the metal The processes used for obtaining sodium, nickel, and copper are, respectively

Consider the following metallurgical processes : (I) Heating impure metal with CO and distilling the resulting volatile carbonyl (b.p. 43^(@)C) and finally decomposition at 150^(@)-200^(@)C to get the pure metal. (II) Heating the sulphide ore in air until a part is converted to oxide and then further heating in the absence of air to let the oxide react with unchanged metal sulphide. (III) Electrolysis of the molten electrolyte containing approximately equal amounts of the metal chloride and NaCl to obtain the metal. The processes used for obtaining magnesium , nickel and copper are respectively.

ALLEN-METALLURGY-EXERCISE-03
  1. Zinc carbonate is precipitated from zinc sulphate solution by the addi...

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  2. The slag obtained during the extraction of copper pyrites is compose...

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  3. In calcination, ore is heated with absence of air

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  4. A number of elements are available in earth's crust but most abundant ...

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  5. Pitch blende is an ore of

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  6. In the metallurgical process for electrorefining of the metal, the ano...

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  7. In a thermite process ………….. Is used as reducing agent.

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  8. The mineral ilmenite contains .........and...........metal

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  9. Answer the following questions briefly. What is the actual reducing...

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  10. Bessemer converter is used for manufacture of

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  11. The transition metal present in the alloy gun metal is .

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  12. The slag obtained during the extraction of copper pyrites is compose...

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  13. If a spoon of copper metal is placed in a solution of ferrous sulphate...

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  14. {:(Column-I(Ore),Column-II("Created formula & properties")),((A)"Iron ...

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  15. {:(Column-I("Metal"),column-II),((A)"Magnesite",(p)"Ore of magnesium")...

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  16. {:(Column-I(Ore),Column-II),((A)"Iron",(p)"Carbon reduction method"),(...

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  17. Statement-I : All the ores are mineral Statement-II : Most of the or...

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  18. Statement-I : In the extraction of Ag the complex Na[Ag(CN)(2)] is rea...

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  19. Aluminium powder is used in thermite welding because :

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  20. Statement-I : CuFeS(2) is concentrated by froath floatation method S...

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