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प्रश्न
State a reason why, when hydrogen is passed over heated copper oxide, the resultant product formed, differs in colour from the original reactant.
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उत्तर
\[\ce{\underset{\text{Black}}{CuO} + H2 ->[heat]\underset{\text{Reddish brown}}{Cu} + H2O}\]
H2 removes oxygen from CuO and reduces it to Cu metal (reddish brown in colour).
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संबंधित प्रश्न
Give one example of an oxidation-reduction reaction which is also a combination reaction.
Define the following in terms of gain or loss of hydrogen with one example:
Oxidation
Name:
an oxidizing agent that does not contain oxygen.
Name:
a gas that is oxidizing as well as a reducing agent.
Name:
a solid that is an oxidizing agent.
Give two test for an oxidising agent.
Oxidising agents are also called as ______ because they remove electrons form other substances.
Find the oxidation number of the elements in the following compounds.
- C in CO2
- Mn in MnSO4
- N in HNO3
Which of the following statements about the given reaction are correct?
\[\ce{3Fe_{(s)} + 4H2O_{(g)} -> Fe3O4_{(s)} + 4H2_{(g)}}\]
(i) Iron metal is getting oxidised.
(ii) Water is getting reduced.
(iii) Water is acting as the reducing agent.
(iv) Water is acting as oxidising agent.
During the reaction of some metals with dilute hydrochloric acid, following observations are made.
The reaction of sodium metal is found to be highly explosive
Explain this observation giving suitable reason.
