Input tax credit

Under GST

1. for production of tax free goods if consumed taxable goods than what will be the tax credit ?

2. If taxable goods purchase from URD and sale to RD and URD also.
-- in this circumstances liability for payment of GST on purchase will be purchaser and collection of GST also seller for register dealer.

than setoff of purchase tax can adjusted in output tax ?

3. Input GST related to purchase of goods and services can be available in any output GST ?