Petroleum is obtained from water gas, name of the reaction involved is
Fischer-Tropsch
Benzoic
Dow's
Kjeldahl's
In municipal sewage, BOD values (in ppm) are:
1-5
100- 4000
50-90
20-40
B.
100- 4000
The amount of oxygen required by bacteria to break down the organic matter present in a certain volume of a sample of water is called biochemical oxygen demand(BOD). The amount of BOD in the water is a measure of the amount of organic material in water in terms of how much oxygen will be required to break it down biologically. Clean water have BOD value less than % ppm whereas highly polluted water such as municpal sewage has BOD value more than 100ppm.
In environmental chemistry, the medium which is affected by a pollutant is called as the.......
sink
slag
solvent
receptor
The maximum prescribed concentration of copper in drinking water is :
0.5 ppm
3 ppm
0.05 ppm
5 ppm
Assertion : Ozone is destroyed by CFCs in the upper stratosphere.
Reason : Ozone holes increase the amount of UV radiation reaching the earth.
Assertion and reason are incorrect.
Assertion is false, but the reason is correct.
Assertion and reason are correct and the reason is the correct explanation for the assertion.
Assertion and reason are correct, but the reason is not the explanation for the assertion.
Which is wrong with respect to our responsibility as a human being to protect our environment ?
Avoiding the use of floodlighted facilities
Setting up compost tin in gardens
Restricting the use of vehicles
Using plastic bags
The layer of atmosphere between 10 km to 50 km above the sea level is called as :
Thermosphere
Troposhere
Mesosphere
Stratosphere
Excessive release of CO2 into the atmosphere results in
depletion of ozone
polar vertex
formation of smog
global warming
The regions of the atmosphere , Where clouds form where we live repectively, are
Troposphere and stratosphere
Stratosphere and Troposphere
Stratosphere and Stratosphere
Troposphere and Troposphere