Q25 of 152 Page 46

What is an oxidation reaction? Identify in the following reaction

(i) the substance oxidised, and


(ii) the substance reduced:


Oxidation reaction represents loss of electron or bonding of an element with oxygen. Addition of oxygen in a reaction is also termed as oxidation

(i) C, carbon is oxidized.


(ii) ZnO, Zinc oxide is reduced.



More from this chapter

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23 When S02 gas is passed through saturated solution of H2S, the following reaction occurs :


In this reaction, which substance is oxidized and which one is reduced?

 24 Fill in the following blanks with suitable words:

(a) The addition of oxygen to a substance is called ......... whereas removal of oxygen is called.........


(b) The addition of hydrogen to a substance is called ......... whereas removal of hydrogen is called.........


(c) Anti-oxidants are often added to fat containing foods to prevent ..........due to oxidation.

 26 (a) What is a redox reaction? Explain with an example.

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


(c) In the reaction represented by the equation:



(i) name the substance oxidised.


(ii) name the oxidising agent.


(iii) name the substance reduced.


(iv) name the reducing agent.

 27 (a) Define a combination reaction.

(b) Give one example of a combination reaction which is also exothermic.


(c) Give one example of a combination reaction which is also endothermic.