Is it worth to buy i3-2120. Or pentium g850 will be good.
typical tasks is: in the same time, open 30-50 tabs in google chrome, listen lossless music, open google earth, read few pdf's, watch hd video on youtube.
Is g850 will be slows down somethimes or not.
With all that going on why haven't you considered a quad-core cpu? Do you have a strict budget?
How much RAM will you be getting? I would suggest 8GB to help handle all those applications.
If it has to be between those 2 cpus, for all those tasks then go with the i3-2120. It will handle all of that a bit better than the pentium.