Percentage of Na+ in 0.9% of NaC1 -

Ans. is 'a' i.e., O.45%Normal saline (isotonic saline)This question is straightforward you can solve it even if you do not know the composition of 0.9% of NaCl 0.9 % NaCl is isotonic saline.0..9%NaCl means 9.0 gm of salt (NaCl) in one litre (i.e.,0.9%) > Out of which Na- is half (0.45%) and Cl is half (0.045)