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State Whether the Following Reaction is Oxidation Or Reduction. \\Ce{Na->Na+}\ - Chemistry

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प्रश्न

State whether the following reaction is oxidation or reduction.

\[\ce{Na->Na+}\]

विकल्प

  • Oxidation

  • Reduction

MCQ

उत्तर

\[\ce{Na->Na+}\] – Oxidation

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अध्याय 2: Chemical Changes & Reactions - Exercise

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विराफ जे दलाल Simplified ICSE Chemistry [English] Class 9
अध्याय 2 Chemical Changes & Reactions
Exercise | Q 1.2

संबंधित प्रश्न

 What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.


Define electrolysis.


Fill in the blank.

Melting of ice is a _______ change.


What is the reaction called when oxidation and reduction take place simultaneously? Explain with one example.


Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.

Potassium fluoride


What do you observe? When

Sodium chloride solution is added to silver nitrate solution.


State the main characteristics of chemical reactions. Give at least one example in each case.


Name: A brown gas 


What is observed in performing the following :

  Hydrogen Oxygen Carbon dioxide Chlorine
Litmus test        
Apply a burning splint to the gas        
Colour of gas colourless colourless colourless greenish-yellow
Odour of gas        

A chemical reaction is often accompanied by external indications or characteristics which include – 

  1. Colour change
  2. Effervescence or gas evolved
  3. Evolution or absorption of heat
  4. Formation of a precipitate.

With reference to each of the above indications, state the external indication seen during – Thermal decomposition of mercury [II] oxide.


Explain the Silver nitrate solution is kept in coloured reagent bottles in the laboratory.


State the following reaction represent oxidation or reduction.

\[\ce{Cl- ->Cl}\]


State the following reaction represent oxidation or reduction.

\[\ce{H->H+}\]


Explain the term chemical reaction with special reference to reactants and products.


A chemical reaction is often accompanied by external indications or characteristics.


______ gas causes tears in our eyes while cutting onions.


Can a nickel spatula be used to stir copper sulphate solution? Justify your answer.


Which of the following are chemical changes?

(i) Decaying of wood

(ii) Burning of wood

(iii) Sawing of wood

(iv) Hammering of a nail into a piece of wood


Give an example of a chemical reaction for each of the following situations:

A change in colour is observed.


Magnesium + oxygen → magnesium oxide.

2Mg + O2 → 2Mg O


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