Q.

Which one is a better fuel, coal, or coke?

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a

Coke is a better fuel because coke produces more heat on burning as compared to coal

b

Coal is a better fuel because coal does not produce more heat on burning as compared to coke

c

Both are of equal efficiency

d

None of these 

answer is A.

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Detailed Solution

Coke is a better fuel because coke produces more heat on burning as compared to coal. Coke has a higher calorific value than coal. When equal masses of coke and coal are burnt, coke produces more heat.
 
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