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प्रश्न
Is it essential that oxidation and reduction must occur side by side in a chemical reaction? Explain
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उत्तर
In a chemical reaction, if one substance is oxidised, the other substance must necessarily be reduced. This is because the electrons lost during oxidation are simultaneously gained during reduction and vice versa.
For example, Zinc reacts with copper sulphate to form zinc sulphate and copper.
CuSO4 + Zn → ZnSO4 + Cu
Cu + 2SO42- + Zn →Zn + 2SO42- + Cu
Writing the half reaction,
Zn → Zn2+ + 2e- (Oxidation)
Cu2+ + 2e-→ Cu (Reduction)
They occur simultaneously as
Cu2+ + Zn→ Zn2++ Cu
Thus, oxidation and reduction always occur simultaneously.
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संबंधित प्रश्न
Define corrosion.
In the reaction represented by the following equation:
\[\ce{CuO_{(s)} + H2_{(g)} -> Cu_{(s)} + H2O_{(l)}}\]
- name the substance oxidised
- name the substance reduced
- name the oxidising agent
- name the reducing agent
Indicate which of the following statement is true and which is false:
The removal of hydrogen from a substance is called reduction.
The colours of aqueous solutions of CuSO4 and FeSO4 as observed in the laboratory are:
(A) pale green and light blue respectively
(B) light blue and dark green respectively
(C) dark blue and dark green respectively
(D) dark blue and pale green respectively
Why this reaction is considered a reversible reaction?
Name:
a substance that oxidizes concentrated HCl to chlorine.
You are provided with two containers made up of copper and aluminium. You are also provided with solutions of dilute HCl, dilute HNO3, ZnCl2 and water. In which of the above containers, can these solutions be kept?
Mention some oxidation reactions that occur in daily life.
The tarnishing of metals is due to the formation of ______.
The sum of the oxidation number of all atoms in a compound is ______.
