मराठी

When a magnesium ribbon burns in air with a dazzling flame and forms a white ash, is magnesium oxidised or reduced? Why?

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प्रश्न

When a magnesium ribbon burns in air with a dazzling flame and forms a white ash, is magnesium oxidised or reduced? Why?

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उत्तर

Magnesium is oxidised when oxygen is added to it, forming magnesium oxide.

\[\ce{\underset{Copper oxide}{CuO} + \underset{Hydrogen}{H2} ->[Heat] \underset{Copper}{Cu} + \underset{Water}{H2O}}\]

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पाठ 1: Chemical Reactions and Equations - Exercise 2 [पृष्ठ ६२]

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लखमीर सिंह Chemistry [English] Class 10
पाठ 1 Chemical Reactions and Equations
Exercise 2 | Q 27. (b) | पृष्ठ ६२

व्हिडिओ ट्यूटोरियलVIEW ALL [2]

संबंधित प्रश्‍न

Corrosion can be prevented by using ……………. solution.


Define ‘redox reaction’. Give one example.


What is an oxidising agent?


Why does the colour of copper sulphate solution change when an iron nail is dipped in it?


Identify the substances that are oxidised and the substances that are reduced in the following reaction.

\[\ce{4Na(s) + O2(g) -> 2Na2O(s)}\]


Why is photosynthesis considered an endothermic reaction?


Identify in the following reaction (a) the substance oxidised, and (b) the substance reduced:

\[\ce{ZnO + C -> Zn + CO}\]


Identify the component oxidised in the following reaction:

\[\ce{H2S + Cl2 -> S + 2HCl}\]


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.


Explain the following in term of gain or loss of oxygen with two examples.

Oxidation


Give the general group study of hydrogen with reference to

reducing power 


Divide the following reactions into oxidation and reduction half-reaction:

Zn + Cu2+ → Cu + Zn 2+


For the reaction PbO + H2→ Pb + H2O, which of the following statements is wrong?


Name: 

a substance that oxidizes concentrated HCl to chlorine.


With reference to oxidation & reduction reaction – complete the statement given by filling in the blanks with only the words (a) Addition (b) Removal.

‘Oxidation is a chemical reaction involving ____ of oxygen to a substance or ____ of hydrogen from a substance. Reduction on the otherhand involves ____ of hydrogen to a substance or ____ of oxygen from a substance.


State the condition and give balanced equation for the conversion of coke to water gas.


Identify the oxidising agent (oxidant) in the following reactions 

`"Pb"_3"O"_4 + 8"HCl" -> 3"PbCl"_2 + "Cl"_2 + 4"H"_2"O"`


What happens when zinc granules are treated with dilute solution of H2SO4, HCl, HNO3, NaCl and NaOH Also write the chemical equations if reaction oçcurs.


When hydrogen gas is passed over black copper oxide, a reddish-coloured layer of copper is formed.

Answer the questions that follow based on this reaction.

  1. Write the equation.
  2. What type of reaction is it?
  3. Complete the blanks:
    In this reaction, an oxygen atom goes away from CuO (copper oxide), which means that ______ of copper oxide takes place, whereas a hydrogen molecule takes up an oxygen atom and water (H2O) is formed, meaning ______ of hydrogen takes place.

A reddish brown metal used in electrical wires when powdered and heated strongly turns black. When hydrogen gas is passed over this black substance, it regains its original colour. Based on this information answer the following questions:

  1. Name the metal and the black substance formed.
  2. Write balanced chemical equations for the two reactions involved in the above information

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