Match the following and choose the correct option given below:-
Compound / Type | Use |
A. Dry ice | I. Anti-knocking compound |
B. Semiconductor | II. Electronic diode or triode |
C. Solder | III. Joining circuits |
D. TEL | IV. Refrigerant for preserving food |
A - I; B - II; C - IV; D - III
A - II; B - III; C - I ; D - IV
A - IV; B - III; C - II; D - I
A - IV; B - II; C - III; D - I
Green chemistry deals with
study of plant physiology
study of extraction of natural products from plants
detailed study of reactions involved in the synthesis of chlorophyll
utilization of existing knowledge base for reducing the chemical hazards along with developmental activities
A sample of sea water contains 5 × 10-3 g of dissolved oxygen in 1 kg of the sample. The concentration of O2 in that sea water sample in ppm is
5
5 × 10-3
5 × 10-2
5 × 10-1
The gas emitted by supersonic jet planes that slowly depletes the concentration of ozone layer is
CO
NO
SO2
O2
The photochemical smog can be suppressed by
nitrogen oxides
hydrocarbons
radical traps
formaldehyde
Which among the following statements are correct?
(i) Carbon monoxide is neutral whereas SO3 is acidic.
(ii) Potassium oxide is basic whereas nitrous oxide is acidic.
(iii) Aluminium and zinc oxides are amphoteric.
(iv) Sulphur trioxide is acidic whereas phosphorus pentoxide is basic.
(v) Carbon dioxide is netural whereas sulphur dioxide is amphoteric.
(ii) and (iii)
(i) and (iv)
(i) and (iii)
(ii) and (iv)
Pick up the correct statement :
CO which is major pollutant resulting from the combustion of fuels in automobiles plays a major role in photochemical smog
Classical smog has an oxidizing character while the photochemical smog is reducing in character
Photochemical smog occurs in day time whereas the classical smog occurs in early morning hours
During formation of smog the level of ozone in the atmosphere goes down
In Antarctica ozone depletion is due to the formation of following compound :
acrolein
peroxyacetyl nitrate
chlorine nitrate
formaldehyde
C.
chlorine nitrate
In Antarctica ozone depletion is caused due to the formation a chlorine compound called chlorine nitrate.
Which one of the following is mainly responsible for depletion of ozone layer?
Methane
Cabon dioxide
Water
Chloro-fluoro carbons