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प्रश्न
Explain the term redox reaction with an example involving the reaction of hydrogen sulphide with chlorine.
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उत्तर
Redox Reaction: “The reaction in which oxidation and reduction take place simultaneously is called Redox Reaction.”
Removal of hydrogen is oxidation. Here `"H"_2"S"` is oxidised to sulphur whereas the addition of hydrogen is reduction.
Here chlorine is being reduced to hydrogen chloride.
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संबंधित प्रश्न
Identify the substances that are oxidised and the substances that are reduced in the following reaction.
\[\ce{CuO_{(s)} + H2_{(g)} -> Cu_{(s)} + H2O_{(l)}}\]
State whether the following conversion is oxidation or reduction:
2Cl- - e-→ Cl2
Explain the term oxidation in term of addition and removal of oxygen/hydrogen with a suitable example.
In the reaction of iron with copper sulphate solution:
CuSO4 + Fe → Cu + FeSO4
Which option in the given table correctly represents the substance oxidized and the reducing agent?
| OPTION | Substance Oxidized | Reducing Agent |
| A | Fe | Fe |
| B | Fe | FeSO4 |
| C | Cu | Fe |
| D | CuSO4 | Fe |
Identify the oxidising agent (oxidant) in the following reactions
`"Pb"_3"O"_4 + 8"HCl" -> 3"PbCl"_2 + "Cl"_2 + 4"H"_2"O"`
During the reaction of some metals with dilute hydrochloric acid, following observations are made.
The temperature of the reaction mixture rises when aluminium (Al) is added.
Explain this observation giving suitable reason.
A silver article generally turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining.
- Why do silver articles turn black when kept in the open for a few days? Name the phenomenon involved.
- Name the black substance formed and give its chemical formula.
The tarnishing of metals is an example of ______ reaction.
______ is a metal that has a high resistance to corrosion.
State the change in colour observed in following case mentioning the reason:
Copper powder is strongly heated in air.
