i wana ask that why cant we drink hard water,though normal water n hard water have same chemical properties??

no they don't, there is a big difference between them.

 

this should be a big hint,

 

What is in hard water(at least in greater quantity) that isn't in soft water?

 

google or wikipedia should answer this easily.

by hard water i ment D2O

by hard water i ment D2O

 

That's heavy water, not hard..there's plenty about heavy water on wiki...

 

http://en.wikipedia.org/wiki/Heavy_water

 

Hard water is fine to drink, I actually live in a hard water area, it just produces limescale, the majority is filtered through chalk.

biggest hint in the universe: heavy things move slow.