which of these contain pure water and why?

Question

1.sea water
2.bore water
3.well water
4.rain water

Answer 1

if by pure, you mean exclusively H2O, the answer is none of the above.
1) by definition is salt water
2) i had to look up the definition: http://www.dh.sa.gov.au/pehs/PDF-files/bore-water-web-06.pdf
and it's effectively filtered by the ground like well water...which doesn't catch biological agents and adds mineral impurities
3) see number 2
4) rain water picks up all sorts of impurities from the environment (acid rain...)

Answer 2

They all contain pure water!! But in order to make the water 100% pure it needs to be distilled. Sea water will have the greatest impurities mainly salt. Bore water, well water and rain water will also contain impurities such as caclium.

Answer 3

Rain water will have the most pure water because the water droplets are condensed out of the air and the other three will have contaminants from the ground.

Rain water however is still not pure water. Rain droplets can form around impurities in the air (one drop falling causes other drops to from) and will absorb smog and other pollutants as it travels down to earth.

Answer 4

4. Rain water will be the purest as it it formed by condensation of water wapour and therefore has no salts dissolved in it. However, these days, there may be chemicals from the atmosphere, like sodium dioxide, which will dissolve in the water droplets and form sulphurous acid (acid rain).

Answer 5

rain water as no minerals/impurities are dissolved in it
others have considerable proportion of salts
rain water can also be called naturally distilled water