Question
Reverse osmosis (Pg.25, Block 2)- water moves through semipermeable membrane
leaving the dissolved ions behind ……………(Margin remark)
(b) JTU- Jackson turbidity unit
NTU-Nephelometric turbidity unit (2)
(c) 1pmm=1 milligram ∕ kilogram
= 10-3
g ∕ line (1)
(d) Sulphates in water systems originate from the oxidation of sulphide ores and their
dissolution.
2Fe S2+H2O+15 [0] → Fe2(SO4)3+H2SO4
FeS2+7[0]+H2O→ FeSO4+H2SO4
2FeSO4+H2SO4+[0]→ Fe (SO4)3+H2O (3)
(3) The portion of hardness that disappears after prolonged boiling is called temporary hardness
and is mainly due to bicarbonates. O2 boiling CaCO3 or Mg CO3 is obtained as a
precipitate along with the evolution of CO2
Answer :
Word Count : 648
Reverse osmosis is one of the most efficient methods of water purification and desalination. It is based on the principle that when pressure greater than the osmotic pressure is applied to a concentrated solution, water molecules are forced through a semipermeable membrane while dissolved salts, ions, organic substances, bacteria, and other impurities are retained on the opposite side. In natural osmosis, water moves from a dilute solution to a concentrated solution through a semipermeable membrane until equilibrium is achieved. In reverse osmosis, this natural process is reversed by applying external pressure. The semipermeable membrane allows only water molecules to pass while leaving dissolved ions behind. Reverse osmosis is _________ _________ __________ _____ _____ _______ ________ _____ ________.
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Reverse osmosis is one of the most efficient methods of water purification and desalination. It is based on the principle that when pressure greater than the osmotic pressure is applied to a concentrated solution, water molecules are forced through a semipermeable membrane while dissolved salts, ions, organic substances, bacteria, and other impurities are retained on the opposite side. In natural osmosis, water moves from a dilute solution to a concentrated solution through a semipermeable membrane until equilibrium is achieved. In reverse osmosis, this natural process is reversed by applying external pressure. The semipermeable membrane allows only water molecules to pass while leaving dissolved ions behind. Reverse osmosis is _________ _________ __________ _____ _____ _______ ________ _____ ________.
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