yes
yup
Yep
yup
The State can place a lien on an IRA to collect child support arrearages, yes.
An IRA has designated beneficiaries.
No, the IRS does not have the legal power to take such action.
yes
IRAs can be seized for child support. I suggest that you contact your State's child support agency. When you get an interview with them, bring all the papers relating to your child support: birth certificates, acknowledgments of paternity, court orders, payment records, etc. Be polite but persistent. Good luck!
For arrears, yes. see links below
In Illinois, yes, even if the child support obligor transfers his IRA into a new spouse's name. See Takata v Hafley at http://www.state.il.us/court/Opinions/AppellateCourt/2008/3rdDistrict/June/3070175.pdf
yup
An IRA is a retirement account for which there are heavy tax penalties for early withdrawal--and that is if you are willing. Most likely tax qualified retirement assets are protected from judgments and garnishments.