Sodium metal is soft whereas sodium chloride is harder
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Explanation:
sodium metal is an element and it is its physical property to be soft
whereas NaCl is a compound of Na which is Formed as a result of chemical reaction (change) and after a chemical reaction the properties of of constituent elements in compound are lost
Thus NaCl is not soft But hard
Another Example for this is water
it has Hydrogen which is highly combustible yet its compound water can extinguish fire
You can also check 9th Std NCERT book
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