Answers

2015-05-11T19:33:56+05:30
Everything that appear coloured is due to absorption of light from the visible region. Water does not absorb light from the visible region and hence appeared colourless.
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2015-05-11T19:59:28+05:30
First, water is transparent and not colorless. This is because water has a slight light blue color which a naked eye cannot see because water has a property which make it absorb the blue light and scatter the white light. 

Next, Water doesn't consist of any specific types of bond and groups of atoms which as I mentioned absorbs the blue light.

Therefore, water is transparent and not colorless.
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