Chemistry MSc

Q: Which has garlic like odour?

(a) :  N2O
(b) :  NO
(c) :  NO2
(d) :  P2O5
(e) :  None of the Above
Answer:  P2O5
Explanation:  

Q: In Pakistan, ethanol is prepared commonly by:

(a) :   fermentation of molasses, starch grains or fruit juices
(b) :   by the reaction of alkenes with water
(c) :   by the oxidation of alkanes
(d) :  by the reaction of Grignaid's reagent with aldehydes
(e) :  None of the Above
Answer:   fermentation of molasses starch grains or fruit juices
Explanation:  

Q: Purification of alcohol above 14% is done by:

(a) :  distillation
(b) :  crystallization
(c) :  solvent extraction
(d) :  filtration
(e) :  None of the Above
Answer:  distillation
Explanation:  

Q: The water in the lake showed signs of eutrophication. What could be the cause of this?

(a) :  Increasing the amount of dissolved fertilizers.
(b) :  Increasing the amount of dissloved oxygen.
(c) :  Decreasing the amount of dissolved mineral salts.
(d) :  Decreasing the number of bacteria.
(e) :  None of the Above
Answer:  Increasing the amount of dissolved fertilizers.
Explanation:  Since, nitrates and phosphates in fertilizers are very soluble in water, they can be washed off the surface of soil by rainwater or leached into the lake. The increase in concentration of nitrates and phosphates encourage rapid growth of algae in the lake.

Q: Oxides of non-metals are:

(a) :  acidic
(b) :  basic
(c) :  amphoteric
(d) :  superoxides
(e) :  None of the Above
Answer:  acidic
Explanation:  

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