Suppose i have a site with PR 0.I exchange links with a site with PR 6.After a month we remove each other's link from our sites,will the Page rank of my site will be then 0 or something greater than 0?
My advice: first get some PR3 and 4 BL (or how many you can), get that PR6 link, and wait min 6 months to increase ur PR to 5. And to keep this position (PR5), make some link exchange with sites with the same PR. in this case, u can "stay safe" about PR Dont buy a PR6 link for a month or two, if this is what you wanna do. Wont help in anything!
You lose the link, you lose PR. Reciprocial links don't help much by the way (no more). Google knows that you exchanged links. Buying links is becoming depreceated by Google, so I wouldn't rely on that.
You won't lose page rank after one month. I would say a minimum of 2 months usually more. If the link was dropped close to an update the page rank will carry over to the next update (upto 4 months).
This will be visible PR, which is missleading. I don't know if PR is updated daily or how often, but if links gone, PR gone, SERPs gone in real time - much faster than in 1 month. But this is really hard to tell, since noone sees real PR (in real time).
It depends on the quality of backlinks of your site. I don't know if how one PR6 will effect your PR.
1 month is not enough and it will not influence your PR. We should wait a bit to see how the new Google algorithm is going to determine the PageRank.
Your PR wont change coz one month is too short to know the results. You should try it longer than a month
a month isn't enough time to affect change to that situation. if you just wait for the result on that, then probably you will get back to your original PR, but if you keep on updating and improving instead of waiting, you will probably have better results.