Water is also called.................
a chemical
an universal solvent
vapour
solution
When water freezes to solid, its volume
decreases
Increases
Constant
None of these
One water molecule consists of two.............atom and one..............atom.
Hydrogen, Oxygen
Chlorine, Oxygen
Hydrogen, sodium
sodium, chlorine
Causes of permanent hardness of water.
Calcium Oxide
Magnesium Sulphate
Calcium Sulphate
Mangnesium Oxide
Human body has about .............of water by weight
90%
70%
50%
65%
The temperature at which ice melt is
melting point
heating point
boiling point
freezing point
40
<p>5<sup>0</sup></p>
<p>3<sup>0</sup></p>
<p>0<sup>0</sup></p>
Boiling point of water is
<p>101<sup>0</sup></p>
<p>100<sup>0</sup></p>
<p>-100<sup>0</sup></p>
Cause of temporary hardness of water
Calcium Carbonate
Calcium bicarbonate
Sodium carbonate
