MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Roasting

From the list...

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.

Open in App

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.

Suggest Corrections

thumbs-up

0

Similar questions

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.

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Roasting

CHEMISTRY

Watch in App

explore_more_icon

Explore more

Standard X Chemistry

Join BYJU'S Learning Program

CrossIcon