Dear You have sought advice on the following issues ;
1. What shall be the liabilities of the company ? =
It would be difficult for any body to asceratin the liability of a closed company. Since the company was in manufactuirng, check with Income Tax, excise, sale tax dept etc. Also, enquire from local PF office regarding workmen's dues etc.
2. Where to get information of statutory liabilities and other liabilities of the closed company ?
You may have to have it from various dept. as referred above
3. Which information can be obtained from ROC (Registrar of Companies)?
In RoC, you may only know about the charges / mortgages etc., if created, in favour of any lender. Also see if the company is defunct, penalty if any imposed by company law board / RoC
Ask the seller first about the known liabilities, give advertisement in news papers, call for the liability. In case nothing comes out, take into account the liability as (i) above and proceed. You have to take reasonable precaution which a ordinery human being can take..