Chemistry Past Questions and Answers

The hybridization of the carbon atom in ethyne is

A Sp 4
B Sp 3
C Sp2
D Sp
E S

Question 372:

An organic compound with a vapour density 56.5 has the following percentage composition:C =53.1% N = 12.4%, O = 28.3%, H = 6.2%. The molecular formula of the compound is Relative atomic masses: N = 14, O = 16, C = 12, H = 1 )

A C3H6O2N
B C5H6O2N
C (C5H7O2N)1/2
D C5H7O2N
E (C5H7O2N)2

Question 373:

When the kerosene fraction from petrol is heated at high temperature, a lower boiling liquid is obtained. This process is known as

A Polymerization
B Refining
C Hydrogenation
D Cracking

Question 374:

Alkaline hydrolysis of naturally occurring fats and oils yields

A Fats and acids
B Soaps and glycerol
C Margarine and butter
D Esters
E Detergents

Question 375:

Which of the following statements is INCORRECT?

A Fractional distillation of crude petroleum will give the folloing hydrocarbon fuels in order of increasing boiling point
B Butane < petrol < kerosene of polythene.
C Both but-1-ene and but-1-yne will decolorize bromine readily
D But-2-ene will react with chlorine to form 2,3-dichlorobutane
E Calcuim carbide will react with water to form any alkyne