Question

thermal decomposition redox reaction
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Answer 1

Answer:

Explanation:The ease with which metals can be extracted from their naturally occurring ores depends upon their position in the Reactivity Series. Your task is to investigate the effect of heating metal oxides and to relate the temperature at which they decompose to the metal's position in the Reactivity Series. As a result of your investigations you should be able to suggest an industrial method for extracting unreactive metals from their ores.

Answer 2

Answer:

Solution

A chemical reaction in which both oxidation and reduction reactions are involved is called an oxidation - reduction reaction or simply a redox reaction.

Ex.

In this reaction, Zn loses two electrons to form Zn+2 and undergoes oxidation. Cu+2 gains two electrons to form Cu and thus undergoes reduction.

Most of the chemical reactions are redox reactions. These are mainly four types of redox reactions. They are

(a) Chemical combination reactions

(b) Chemical decomposition reactions

( c) Chemical displacement reactions and

(d) Chemical disproportionation reactions

a) Chemical combination reactions :

Ex : Burning of coal in air.

C(s)0+O2(g)0→C+4O2(g)−2

In this reaction the oxidation numbers of carbon and oxygen are zero. In CO2, the oxidation number of 'C' is +4 and that of oxygen is -2. As the oxidation number of carbon increase from 0 to +4, we say that carbon undergoes oxidation. Similarly the oxidation number of oxygen decreases from 0 to -2. Hence the oxygen undergoes reduction. Since this reaction