Dear friends Is it OK to have multiple Blogs with same posts. As backlinks from these Blogs will be coming from multiple class C IPs , so resulting in more inbound links for my site
it is very bad to do so, you will not get your site in good position, and google wont index your post also.
Nope, it's bad idea, Google may penalize all sites keeping one that is the source of original content.
Blogs with same posts but having different C-Class IP............... This process has major benefit that you wud get backlinks for ur blogs. But here is one issue, this is duplicate content. So as i know Google never punish you for duplicate content means it wud not stop indexing your blogs or posts. But that's other thing you wud not get higher rankings for all of those leaving one who has better backlinks and strong domain......................... Now u cud decide what u wanna do, i mentioned both benefit and drawback...............
even though its a different C-Class IP it would still result to duplicate content. Try to modify every phrase of each paragraph if you want those post.