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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

 

(iv) A student while walking on the road observed that a cloud of black smoke bleached out from the exhaust stack of moving trucks on the road. Choose the correct reason for the production of black smoke:
1 Limited supply of air leads to incomplete combustion of fuel.  
2 Rich supply of air leads to complete combustion of fuel.  
3 Rich supply of air leads to a combination reaction.  
4 Limited supply of air leads to complete combustion of fuel.  

Ans.

(1)