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Solution


Q.

Read the passage carefully and answer the following questions from (i) to (v):

 

Chemistry in Automobiles:
For an internal combustion engine to move a vehicle down the road, it must convert the energy stored in the fuel into mechanical energy to drive the wheels. In your car, the distributor and battery provide this starting energy by creating an electrical "spark", which helps in combustion of fuels like gasoline. Below is the reaction depicting complete combustion of gasoline in full supply of air.

 

2 C subscript 8 H subscript 18 left parenthesis l right parenthesis space plus space 25 O subscript 2 left parenthesis g right parenthesis space rightwards arrow space 16 X apostrophe

 

(ii) Identify the types of chemical reaction occurring during the combustion of fuel:
1 Oxidation and Endothermic reaction  
2 Decomposition and Exothermic reaction  
3 Oxidation and Exothermic reaction  
4 Combination and Endothermic reaction  

Ans.

(3)

Oxidation and Exothermic reaction