Give reason: Sand is used during roasting and as sand bath in chemical reactions.

Give reason: Sand is used during roasting and as sand bath in chemical reactions.
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1 Answer

Answer :

As silicon has high thermal and non combustible property.
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Extraction of copper is done using copper pyrites. After roasting, the ore is mixed with silica and coke and then smelted in a blast furnace. The matt

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Choose the correct option the code regarding roasting process. (I) It is the process of heating the ore in air in a reverberatory furnace to obtain th

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Which of the following faction is of no significance for roasting sulphide ores to the oxide and not subjecting the sulphide ores in carbon reduction

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Match the conversions in Column I with the type(s) of reaction(s) given in Column II. `{:("Column I","ColumnII"),(A. "PbS"rarr"PbO",p. "Roasting"),(B.

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Roasting is carried out to :

Description : Roasting is carried out to :

Last Answer : Roasting is carried out to : A. convert sulphide to oxide and sulphate B. remove water of ... melt the ore D. remove arsenic and sulphur impurities

Roasting of copper pyrites is done:

Description : Roasting of copper pyrites is done:

Last Answer : Roasting of copper pyrites is done: A. to remove moisture and volatiaile impurities B. C. D.

Out of `Cu_(2)S,HgS,Ag_(2)S` and ZnS roasting will convert the mineral in to metal case of

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Roasting is carried out in case of:

Description : Roasting is carried out in case of:

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In sulphation roasting of `ZnS` products are

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Roasting of copper ore is carried out in which of the following furnace?

Description : Roasting of copper ore is carried out in which of the following furnace?

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(A) Roasting is a process in which the ore is heate in presence of air (R ) Concentration of sulphide ore is done by calcinaiton

Description : (A) Roasting is a process in which the ore is heate in presence of air (R ) Concentration of sulphide ore is done by calcinaiton

Last Answer : (A) Roasting is a process in which the ore is heate in presence of air (R ) Concentration of sulphide ... . If (A) is incorrect but (R ) is correct

What size roasting pan do I need?

Description : What size roasting pan do I need?

Last Answer : You can use the 17x11 size or the 19x14 size. If you think this is the absolute largest turkey you are ever going to cook, then I'd go with the 17x11. If you think that you may want to cook a 25 pounder in the future then opt for the 19x14.

The use of heat treatment of ore that includes smelting and roasting is termed as - (1) Electrometallurgy (2) Hydrometallurgy (3) Pyrometallurgy (4) Cryometallurgy

Description : The use of heat treatment of ore that includes smelting and roasting is termed as - (1) Electrometallurgy (2) Hydrometallurgy (3) Pyrometallurgy (4) Cryometallurgy

Last Answer : (3) Pyrometallurgy Explanation: Pyrometallurgy consists of the thermal treatment of minerals and metallurgical ores and concentrates to bring about physical and chemical transformations in the materials to enable ... in a blast furnace in order to fuse the desired metals into impure molten bullion.

Copper is refined by - (1) roasting (2) oxidation (3) electrolysis (4) zone refining

Description : Copper is refined by - (1) roasting (2) oxidation (3) electrolysis (4) zone refining

Last Answer : (1) roasting Explanation: Copper is refined by the method of roasting. In the roaster, the copper concentrate is partially oxidised to produce "calcine" and sulfur dioxide gas. In roasting, the ... ore concentrate is treated with very hot air. This process is generally applied to sulphide minerals.

Heating of a ore below its melting point in the absence of air is known as – (1) Refining (2) Calcination (3) Roasting (4) Smelting

Description : Heating of a ore below its melting point in the absence of air is known as – (1) Refining (2) Calcination (3) Roasting (4) Smelting

Last Answer : (2) Calcination Explanation: Calcination involves simple decomposition of ore on heating below its melting point usually in absence of air to produce new compounds having higher percentage of ... as removing the moisture, organic matter and volatile impurities. Calcination makes the ore porous.

The metallurgical process in which a metal is obtained in a fused state is called - (1) roasting (2) calcinations (3) smelting (4) froth floatation

Description : The metallurgical process in which a metal is obtained in a fused state is called - (1) roasting (2) calcinations (3) smelting (4) froth floatation

Last Answer : (3) smelting Explanation: The metallurgical process in which a metal is obtained in a fused state is called smelting.

The use of Heat treatment of ore that includes smelting and roasting is termed as–

Description : The use of Heat treatment of ore that includes smelting and roasting is termed as–

Last Answer : Pyrometallurgy

Shaft furnaces are used for (A) Smelting (B) Calcining (C) Roasting (D) All (A), (B) and (C)

Description : Shaft furnaces are used for (A) Smelting (B) Calcining (C) Roasting (D) All (A), (B) and (C)

Last Answer : Corporate Strategy

Hearth furnaces are not used for (A) Roasting (B) Melting (C) Reheating (D) None of these

Description : Hearth furnaces are not used for (A) Roasting (B) Melting (C) Reheating (D) None of these

Last Answer : (D) None of these

Reverberatory furnace is used for (A) Roasting/reduction of ores (B) Annealing steel coil (C) Heating air (D) Steel melting

Description : Reverberatory furnace is used for (A) Roasting/reduction of ores (B) Annealing steel coil (C) Heating air (D) Steel melting

Last Answer : (A) Roasting/reduction of ores

The main industrial source of emission of hydrogen sulphide air pollutant is (A) Petroleum refineries (B) Coal based thermal power plants (C) Pulp and paper plant (D) Metallurgical roasting & smelting plant

Description : The main industrial source of emission of hydrogen sulphide air pollutant is (A) Petroleum refineries (B) Coal based thermal power plants (C) Pulp and paper plant (D) Metallurgical roasting & smelting plant

Last Answer : (B) Coal based thermal power plants

Brinjal variety developed for roasting (bharata) purpose is — a. Phule Arjun b. Phule Harit c. Phule Vaibhav d. Phule Raja

Description : Brinjal variety developed for roasting (bharata) purpose is — a. Phule Arjun b. Phule Harit c. Phule Vaibhav d. Phule Raja

Last Answer : b. Phule Harit

Unreacted core model' represents the reaction involving (A) Combustion of coal particles (B) Roasting of sulphide ores (C) Manufacture of carbon disulphide from elements (D) None of these

Description : Unreacted core model' represents the reaction involving (A) Combustion of coal particles (B) Roasting of sulphide ores (C) Manufacture of carbon disulphide from elements (D) None of these

Last Answer : (B) Roasting of sulphide ores