chemistry a level

i did this question: If the solution of chromate(VI) ions is then acidified, the colour of the solution changes to orange as dichromate(VI) ions form. Write the equation for this change. State symbols are not required.
the answer that i got was Cr2O ^2- + 1.5O2 ----- Cr2O7^2-
the markscheme says 2CrO4^2- + 2H+ ------ Cr2O7^2- + H2O
will i still lose the mark because overall i still got the same product i just used different reactants???

The formula of chromate(VI) is CrO4^2-, and since the Q states that "the solution of chromate(VI) ions is then acidified" so starting with a different reactant cannot score you a mark.