Key Concept: Gaseous fuels: CNG, LPG
c) Assertion is true, but Reason is false.
[Solution Description]
The assertion states that CNG is considered a sustainable fuel for automobiles because it produces fewer harmful emissions. This is true as CNG burns more cleanly compared to petrol and diesel, emitting lower levels of pollutants like carbon monoxide and nitrogen oxides.
The reason states that the calorific value of CNG is higher than that of petrol and diesel, making it a more efficient fuel. This is false. According to the syllabus, the calorific value of CNG is 50000 kJ/kg, which is actually lower than that of petrol and diesel, both of which have a calorific value of 45000 kJ/kg.
Therefore, the assertion is true, but the reason is false.
Your Answer is correct.
c) Assertion is true, but Reason is false.
[Solution Description]
The assertion states that CNG is considered a sustainable fuel for automobiles because it produces fewer harmful emissions. This is true as CNG burns more cleanly compared to petrol and diesel, emitting lower levels of pollutants like carbon monoxide and nitrogen oxides.
The reason states that the calorific value of CNG is higher than that of petrol and diesel, making it a more efficient fuel. This is false. According to the syllabus, the calorific value of CNG is 50000 kJ/kg, which is actually lower than that of petrol and diesel, both of which have a calorific value of 45000 kJ/kg.
Therefore, the assertion is true, but the reason is false.