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The colour of Cu filing changes to black on heating. This change in colour occurs because
Everything turns black on heating.
Cu filing reacts with oxygen present in the air to form Cu2O.
On heating, Cu reacts with oxygen present in the air to form CuO.
On heating, Cu reacts with nitrogen present in the air to form CuN.
The colour of Cu filing changes to black on heating. This change in colour occurs because on heating Cu reacts with oxygen present in the air to form CuO.
A combustion reaction is also called a/an
Reduction reaction
Endothermic reaction
Exothermic reaction
Displacement reaction
A combustion reaction is also called an exothermic reaction
In the following reaction, reduction occurs because of
N2
H2
NH3
All of these
Addition of hydrogen causes the reduction of N2 in the above reaction.
A redox reaction involves
Oxidation followed by reduction
Reduction followed by oxidation
Simultaneous oxidation and reduction
None of these
Redox reactions are reactions in which oxidation and reduction take place simultaneously.
Find the oxidising agent in the given reaction.
ZnO
C
Zn
CO
Carbon is the oxidising agent in the reaction.
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