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Questions
Define ‘redox reaction’. Give one example.
What is redox reaction? Explain with one example
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Solution 1
When oxidation and reduction occur simultaneously in a given chemical reaction, it is known as a redox reaction.
Example of a redox reaction:
Reduction Oxidation
BaSO4 +4C → BaS+4CO
Solution 2
The reaction in which simultaneous oxidation and reduction take place is called a redox reaction
Cu+2 + Zn → Zn+2 + Cu
in the above reaction, copper undergoes reduction whereas Zn undergoes oxidation.
Therefore the reaction is redox reaction.
Solution 3
The reaction in which one substance gets oxidised and other gets reduced is known as redox reaction.
Example:
ZnO + C → Zn + CO
Here, C is oxidised to CO because oxygen is being added and ZnO is reduced to Zn because oxygen is being removed. Therefore, it is a redox reaction.
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RELATED QUESTIONS
The addition of oxygen to a substance is called ______ whereas removal of oxygen is called ______.
Explain the following in terms of gain or loss of oxygen with one example:
Reduction
In the context of redox reactions, the removal of hydrogen from a substance is known as ______.
The process of respiration is ______.
Fill in the blank
Oxidation is the removal of ......................and addition of ....................
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In redox reaction oxidation and reduction occur ............................
Define an oxidation reaction.
MULTIPLE CHOICE QUESTIONS
The process of adding oxygen to a substance is called
- oxidation.
- reduction.
- displacement.
- hydrogenation.
TRUE \ FALSE
Hydrogen is a good oxidizing agent.
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
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Fe + S → FeS
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alkali metals
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a liquid that is an oxidizing agent as well as a reducing agent.
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Explain the term oxidation in term of addition and removal of oxygen/hydrogen with a suitable example.
Give two tests for a reducing agent.
Select the correct answer from the symbol in the bracket.
The element, which like hydrogen is a strong reducing agent.
Find the oxidation number of the elements in the following compounds.
- C in CO2
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Identify the reducing agent in the following reactions
`2"H"_2 + "O"_2 -> 2"H"_2"O"`
Identify the oxidising agent (oxidant) in the following reactions
`"Pb"_3"O"_4 + 8"HCl" -> 3"PbCl"_2 + "Cl"_2 + 4"H"_2"O"`
Identify the oxidising agent (oxidant) in the following reactions
`"V"_2"O"_5 + 5"Ca" -> 2"V" + 5"CaO"`
Which among the following are physical or chemical change?
Burning of Liquefied Petroleum Gas (LPG)
Which among the following are physical or chemical change?
Curding of milk
During the reaction of some metals with dilute hydrochloric acid, following observations are made.
Silver metal does not show any change
Explain this observation giving suitable reason.
Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid whereas copper does not. Explain why?
On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, white precipitate is obtained :
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______ is a metal that has a high resistance to corrosion.
Choose the odd one out and write the reason:
What is rancidity?
Find the oxidation number of the element in the following compound.
Zn in ZnSO4
Find the oxidation number of the element in the following compound.
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Metals are good ______.
