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General Principles And Processes of Isolation Of Elements

Short Answer Type

121.

Name the process and the chemical by which sodium is extracted on large scale?

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One Word Answers

122.

Which method of metal refining is generally used when a metal of high degree of purity is needed?

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Short Answer Type

123.

Name the two volatile metals.

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124.

Explain the froth floatation of concentrating ores.

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125.
What type of ores are roasted?

In roasting ore is heated in the presence of excess of oxygen or air. This method is employed for sulphide ores. Example: ZnS (sphalerite) and Cu₂S (chalcocite).

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126.

Write a chemical equation for the roasting of an ore of each type.

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127.

Explain the following:
Coke and flux are used in the smelting.

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128.

Explain the following:
Partial roasting of sulphide ore is done in the metallurgy of copper.

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129.

How will you differentiate between:
Gangue and flux

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130.

How will you differentiate between:
Flux and slag

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