set 2 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 3 EXERCISES
The following question based on environmental chemistry topic of general science mcq
(a) Sodium aluminum borosilicate
(b) Sand, red lead and potassium carbonate
(c) Zinc and barium borosilicate
(d) Pure silica and zinc oxide
The correct answers to the above question in:
Answer: (b)
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Read more environmental chemistry Based General Science Questions and Answers
Question : 1
Dinitrogen and dioxygen are main constituents of air but these do not react with each other to form oxides of nitrogen because __________.
a) the reaction can be initiated only in presence of a catalyst.
b) oxides of nitrogen are unstable.
c) the reaction is endothermic and requires very high temperature.
d) N2 and O2 are unreactive.
Answer »Answer: (c)
Question : 2
The filament of an electric bulb is of tungsten because –
a) It is cheaper
b) Its resistance is negligible
c) Its melting point is high
d) Filament is easily made
Answer »Answer: (c)
Question : 3
Ozone layer in upper atmosphere (stratosphere) is destroyed by –
a) chlorofluoro carbon (CFC)
b) photochemical smog
c) hydrochloric acid
d) sulphur dioxide
Answer »Answer: (a)
Question : 4
The statement which is not true:
a) SO3 is more harmful air pollutant than SO2
b) NO2 does not play any role in photochemical smog
c) SO2 does not affect larynx (voice box)
d) NO is more toxic to living tissues than NO2
Answer »Answer: (a)
SO3 is more harmful pollutant than SO2.
Question : 5
Green chemistry means such reactions which
a) reduce the use and production of hazardous chemicals
b) are related to the depletion of ozone layer
c) produce colour during reactions
d) study the reactions in plants
Answer »Answer: (a)
Green chemistry may be defined as the programme of developing new chemical products and chemical processes or making improvements in the already existing compounds and processes so as to make them less harmful to human health and the environment.
This means the same as reducing the use and production of hazardous chemicals. i.e. the correct answer is an option (a).
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