Must we chant Srirama Japam only when we are physically pure? Adiyen generally chants during household chores, while driving, etc. Is this appropriate?

There is a mantra called Sirama Mantra which must be obtained as preaching from one’s Acharya and it must be chanted only after taking a bath. Srirama nama japam can be done at any time. No harm in us reciting. There is a difference between these two – a mantra must not be chanted, but a Nama can be.