The number of milli equivalents of acid in 100mL of 0.5N HCl solution is:
1) The product of the number of ML of acid and the concentration of the acid in NORMALITY will give the number of M Equivalents of the acid.
2) No. Of milliequivalent =normality × volume (ml)
So 0.5×100
=50 milliequivalent.
Hence, the correct option is A