Month: March 2019

A. Impart colour to it, for easy identification
B. Minimise the gum formation
C. Prevent icing of the carburettor
D. Prevent the lead build up in engines

A. Smoking tendency of hydrocarbons increases in the order: paraffins → isoparaffins →
naphthenes → aromatics
B. Smoking tendency of paraffins increases with decrease in its molecular weight
C. Smoking tendency of naphthenes decreases with its increasing molecular weight & also on
addition of double bond
D. Smoking tendency of aromatics decreases with increase in its molecular weight

A. R-COOH
B. R-S-H
C. R-S-R
D. R-S-R’

A. 0
B. 100
C. 50
D. ∞

A. Aromatics
B. Mercaptans
C. Paraffins
D. Naphthenic acid

A. Abel apparatus
B. Pensky-Martens apparatus
C. Saybolt chromometer
D. None of these

A. Sulphur
B. Nitrogen
C. Oxygen
D. None of these

A. Liquid lighter than water
B. Liquid heavier than water
C. Gas lighter than air
D. Gas heavier than air

A. Alkylation of unsaturated
B. Presence of sulphur
C. Oxidation & polymerisation of unsaturated
D. Higher aromatic content

A. 0-5
B. 20-25
C. 60-75
D. 100-120