ANS:A - increases

With an increase in the molecular weight of aromatics present in kerosene, its smoking tendency typically increases. Here's why:

• Smoking Tendency: Aromatic hydrocarbons in kerosene contribute to its smoking tendency when burned. This tendency is influenced by several factors, including the molecular weight of the aromatics.
• Molecular Weight Influence: Higher molecular weight aromatics tend to produce more soot and smoke particles when burned compared to lower molecular weight aromatics. This is because higher molecular weight compounds often have more complex molecular structures, which can lead to incomplete combustion and the formation of carbonaceous particles (soot) that contribute to smoke.
• Effect on Kerosene: As the content of heavier aromatics increases in kerosene, its smoking tendency generally increases due to the greater likelihood of incomplete combustion and soot formation during combustion.