Metal used to reduce the following:- …

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Metal used to reduce the following:- a) oxides of less reactive, moderately reactive and highly reactive metal

Posted by Jyoti Yadav 5 years, 8 months ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 5 years, 8 months ago

Extraction of Less Reactive Metals:

The less reactive metals are extracted by the reduction of their oxides by heat alone.

Example: Mercury (II) sulphide ore is roasted in air when mercury (II) oxide is formed. When this mercury (II) oxide is heated to about 300° C, it decomposes to form mercury metal.

Extraction of Moderately Reactive Metals:

The moderately reactive metals in the middle of the reactivity series are extracted by the reduction of their oxides with carbon, aluminium, sodium or calcium.

It is easier to obtain metals from their oxides (by reduction) than from carbonates or sulphides. So, before reduction can be done, the ore is converted into a metal oxide. The concentrated ores can be converted into metal oxides by the process of calcination or roasting.

Extracting Metals towards the Top of the Activity Series:

Metals high up in the reactivity series are very reactive. These metals have a strong affinity for oxygen. So, oxides of sodium, magnesium, calcium and aluminium cannot be reduced by carbon.

These metals are obtained by electrolytic reduction.

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Posted by Pandey Ji 4 months, 2 weeks ago

CBSE > Class 10 > Science