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प्रश्न
Which among the following are physical or chemical change?
Curding of milk
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उत्तर
Chemical
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संबंधित प्रश्न
Fill in the following blanks with suitable words:
The addition of oxygen to a substance is called ......... whereas removal of oxygen is called ........
Give one example of an oxidation-reduction reaction which is also a combination reaction.
When copper powder is heated strongly in air, it forms copper oxide. Write a balanced chemical equation for this reaction. Name (i) substance oxidised, and (ii) substance reduced.
Hydrogen burns with a ______ flame and ______ sound is heard.
Compare hydrogen with alkali metals on the basis of:
Oxide formation
Give the general group study of hydrogen with reference to
reducing power
Describe briefly the ionic concept of oxidation and reduction. Give an equation to illustrate.
In the following reaction: A+ + B → A + B+. Write half-reactions for this reaction and name:
- oxidizing agent
- substance oxidized
- reducing agent
Reacting with water, an active metal produces
Complete and balance the following equation:
H2 + S → ___________
When the positive charge on an ion increases or the negative charge on them decreases it is called as _______.
Oxidising agents are also called as ______ because they remove electrons form other substances.
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
`"V"_2"O"_5 + 5"Ca" -> 2"V" + 5"CaO"`
Identify the oxidising agent (oxidant) in the following reactions.
`"CuO" + "H"_2 -> "Cu" + "H"_2"O"`
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.
Write a short note on oxidizing and reducing agents.
What is a redox reaction?
State the change in colour observed in following case mentioning the reason:
Copper powder is strongly heated in air.
