How is biogas produced?
- ABy burning plastic and paper waste.
- BBy anaerobic decomposition of organic waste in the presence of water and specific bacteria.
- CBy chemical synthesis of methane from carbon dioxide.
- DBy electrolysis of water mixed with organic matter.
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The ozone layer forms naturally by
Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R).$
Assertion $(A):$ Photochemical smog causes cracking of rubber.
Reason $(R):$ Presence of ozone,nitric oxide,acrolein,formaldehyde and peroxyacetyl nitrate in photochemical smog makes it oxidizing.
Choose the most appropriate answer from the options given below:
Assertion $(A):$ Photochemical smog causes cracking of rubber.
Reason $(R):$ Presence of ozone,nitric oxide,acrolein,formaldehyde and peroxyacetyl nitrate in photochemical smog makes it oxidizing.
Choose the most appropriate answer from the options given below:
What is Biochemical Oxygen Demand $(BOD)$?
Easy
View SolutionAmong the following compounds,which one is not primarily responsible for the depletion of the ozone layer in the stratosphere?
$A$ water sample is reported to be highly polluted if the $BOD$ (Biological Oxygen Demand) value of the sample becomes:
DifficultAIEEE 2012
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