[AC Question]

how do i log out of the google play account on a mobile phone ?

[B. Diddy]

Welcome to Android Central! You can't really log out of your Google account on your phone, because your needs to be linked to your Google account. That's why you should have a good screenlock, because if someone gets access to your phone, they could access all aspects of your Google account.

If you have multiple Google accounts, you can switch accounts on your Google Play Store, but you can't log out completely. The closest you could get would be to remove your Google account, but then your device would probably be less useful.