40
<p>5<sup>0</sup></p>
<p>3<sup>0</sup></p>
<p>0<sup>0</sup></p>
Cause of temporary hardness of water
Calcium Oxide
Calcium Carbonate
Calcium bicarbonate
Sodium carbonate
Boiling point of water is
<p>101<sup>0</sup></p>
<p>100<sup>0</sup></p>
<p>-100<sup>0</sup></p>
Human body has about .............of water by weight
90%
70%
50%
65%
The presence of high coliform counts in water indicate
Contamination by human wastes
Phosphorus contamination
Decreased biological oxygen demand
Hydrocarbon contamination
Water is also called.................
a chemical
an universal solvent
vapour
solution
The temperature at which ice melt is
melting point
heating point
boiling point
freezing point
Causes of permanent hardness of water.
Magnesium Sulphate
Calcium Sulphate
Mangnesium Oxide
One water molecule consists of two.............atom and one..............atom.
Hydrogen, Oxygen
Chlorine, Oxygen
Hydrogen, sodium
sodium, chlorine
