4. The true statement for the acid of phosphorus,
H2PO2, H3PO3 and H3PO4 is :
(a) The order of their acidity is H3PO4 > H3PO3 >
H3PO2
(b) All are reducing in nature
(c) All are tribasic acids
(d) The geometry of phosphorus is tetrahedral in all of
these
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Explanation:
provides drinking water.
It provides irrigation water.
It is responsible for the increase in groundwater level.
It reduces storm water discharge, urban flood and overloading of sewage treatment plants.
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