Hi If my Adsense Account is Approved with site A.but i do not place Adsense Ads on that site and Past them in any other Blog that have same niche.and do not place ads on approved site is it against Terms of Google.or i can do this.
Your site A is the site that you pass for approval, so you need to put adsense on it. Or google might think that site B is not yours or you are just using other site in order to get approve in adsense.
You're gonna get banned... and this is not a permanent... this is forever... The best way is to pass Google verification once again for your blog.
As soon as your site is according to their TOS then you can use your adsense on it without any problem.