Q: Naphthalene burns with a yellow sooty flame. This is because
(a)carbon to hydrogen ratio is low
(b)there is incomplete combustion
(c)there is excess supply of air
(d)presence of impurities of nitrogen and sulfur
Correct Answer: (b)
The correct answer is (c) 'there is excess supply of air'. This question from the Quantitative Aptitude & Data Interpretation domain tests knowledge of Numerical Ability.