1. Naphthenes are also called as _______
a) cyclo alkanes
b) aromatics
c) cyclo alkenes
d) cyclo alkynes
Explanation: Naphthenes can also be called as cyclo alkanes. Aromatics are mostly benzene rings.
2. Naphthenes having more than 20 C-atoms are called as ________
a) cyclo alkenes
b) cyclo alkanes
c) cyclo paraffins
d) cyclo alkynes
Explanation: Cyclo paraffins are the Naphthenes having more than 20 C-atoms. The other cyclo compounds may have more than 20 carbon atoms but they are not Naphthenes.
3. Olefins are slightly soluble in ___________
a) water
b) alcohol
c) kerosene
d) ethanol
Explanation: Olefins are slightly soluble in water. The branching increases the solubility of hydro carbons(Olefins).
4. Olefins containing 2 to 4 carbon atoms are ______ at ordinary temperature.
a) solid
b) liquid
c) gaseous
d) semisolid
Explanation: The olefins containing 2 to 4 carbons are very small hydro carbons and they will be in gaseous state generally at room temperature.
5. Aromatic compounds are produced from ________
a) natural gas
b) coal tar
c) oil gas
d) heavy gas
Explanation: Aromatic compounds are produced from coal tar. They are of fruity odor that means they will have some sweet smell.
6. Aromatic compounds are _____ with water.
a) dissolves
b) immiscible
c) forms lump
d) easily dissolves
Explanation: Aromatic compounds do not dissolve in water. They do not form lumps with water but olefins will dissolve in water slightly.
7. The flame colour of the aromatic compounds is ________
a) yellow
b) orange
c) green
d) pink
Explanation: The flame color of the aromatic compounds is in yellow as a lot of carbon in the compound changes into carbon black results in yellow flame.
8. Removal of water is done by ___________
a) Orsteds process
b) Kjeldahl’s process
c) Filtration
d) Cottrells process
Explanation: Cottrells process is used to remove the water from the petroleum. kjeldahl’s process is used to know the percentage of nitrogen in the coal sample.
9. Crude oil is in the form of ____________
a) emulsion of oil and brine
b) emulsion of oil and impurities
c) emulsion of brine and impurities
d) emulsion of impurities and moisture
Explanation: The crude oil is obtained from the earth’s crust which will be in the form of emulsion of oil and brine. It is very stable. When this emulsion is charged then water gets separated from the oil.
10. To remove sulphur compounds from petroleum, it is treated with __________
a) copper nitrate
b) copper oxide
c) magnesium chloride
d) sodium chloride
Explanation: The sulphur compounds can be removed by treating with copper oxide as the sulphur compounds are get converted into the insoluble copper sulphide.