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Roasting

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Question

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.

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Solution

$1.$ Pulverisation refers to crushing of the ore into a fine powder. Thus, pulvurised ore is powdered ore.
$2.$ Calcination, refers to heating of the ore in the absence of air (or in a limited supply of air) to a high temperature (below the melting point of the ore). During calcination, organic matter, moisture, volatile impurities like carbon dioxide and sulphurdioxide are expelled from the ore. It makes ore porous.

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Q. Assertion :Roasting is a process in which the ore is heated strongly in absence of air. Reason: Concentration of sulphide ore is done by calcination.

State True or False.

The process of heating concentrated ore to a high temperature in excess air is called Roasting. State whether it is true or false

Q. Choose the correct option for the following statements
Statement - 1: Sulphide ore is firstly converted to oxide and then it is subjected to reduction for the extraction of metal.
Statement - 2: In calcination, the ore is heated in a regular supply of air in a furnace at a temperature below melting point of the calcined product.
Statement - 3: Roasting involves heating in absence of air until volatile matter escapes.
Statement - 4: In the metallurgy of aluminium, purified

A l_{2} O_{3}

N a_{3} A l F_{6}

C a F_{2}

which increases the melting point of the mix.

Q. In extractive metallurgy of zinc, partial fusion of ZnO with coke is called ______ and reduction of the ore to molten metal is called ______ (smelting, calcining, roasting, sintering).
1. Roasting; calcining
2. Roasting; smelting
3. Sintering; smelting
4. Sintering; calcining

Q. Assertion :In smelting, roasted ore is heated with powdered coke in presence of a flux. Reason: Oxides are reduced to metals by

C

C O

. Impurities are removed as slag.

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