25.00 mL of a 0.150 M solution of nitric acid is mixed with 75.00 mL of a 0.225 M solution of perchloric acid.
(A)Calculate the concentrations of all solute species present in the
mixture. (0.206 M, 0.0375 M, 0.169 M)
(B)Calculate the pH of the mixture. (0.686)

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

its first and third is your answer i did the qustion the fourth isnt right

i think its 100

i hope this !