In such an experiment 25CM³of 0.2M of sodium carbonate neutralises 50cm of tje Hydrochloric acid what is the morlarity of the acid

I dont know what 25CMP is. If you mean 25 cm^3

Normality acid(volume)=Normalitybase (volume)
Na*50=2*.2*25
then Normality of acid is .2
and then Molarity is .2M