The diameter of a water molecule is of the order of

6. The diameter of a water molecule is of the order of...................

 

Dear student
The approximate diameter of water molecules is 2.75 angstroms.
 One angstroms is equals to 10^-10 metre.
So , 2.75 angstroms is equal to 2.75 $\times$10^-10 m
 Hence ,order of magnitude is -10

Regard