Application not getting exit in Samsung Galaxy Grand Duos

I have just bought Samsung Galaxy Grand Duos. It is very good phone for Rs 20k in India.
I am facing problem with few apps like if i go to Internet with default browser I can not exit it properly.
If I use back key, I get back on main screen but it shows Internet as 'Active Application' and it keeps using some part of RAM.

Same problem is with Google Chrome. So I have installed Opera Mini which has proper Exit button.

Please any one know how to properly exit from default browser or Chrome??

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I recommend you download an application manager program from the play store.

sent from my phone