(1) In the case of a sale in the course of export under section 5 of the Central Sales Tax Act, 1956 (74 of 1956); or sale of any input made to any dealer in a special economic zone outside the customs territory of India; or sale (including sale outside India and Domestic Tariff Area) by an export oriented unit, there shall be no tax payable on the turnover of such sale and the person exporting the goods or selling them shall be entitled, in the manner prescribed, to a credit of input tax paid--
         (a) on the purchase of the goods sold in the course of export (excluding sale to Domestic Tariff Area) or purchase of goods sold to any dealer in the special economic zone or sale (including sale outside India and Domestic Tariff Area) by an export oriented unit, or
         (b) on the purchase of inputs and capital assets which have been used for the manufacture of goods sold in the course of export (excluding sale to Domestic Tariff Area) or to any dealer in the special economic zone:
     Provided that the input tax credit on account of capital assets shall be allowed only to the extent and in the manner prescribed.
     (2) The organisations specified in the Schedule V to this Act shall be entitled to claim a refund of tax paid on goods purchased in the State of Bihar, subject to such restrictions and conditions as may be prescribed and such organisation shall be entitled to a refund of the same only on an application made to the prescribed authority within such time and in such manner as may be prescribed.