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In Kjeldahl's method for the estimation of N_2, potassium sulphate and copper sulphate are used. On the basis of their functions which of the following statement(s) is/are correct?
(i) Potassium sulphate raises the bpt. and ensures complete reaction.
(ii) Copper sulphate acts as catalyst.
(iii) Potassium sulphate acts as catalyst and copper sulphate raises the bpt.
(a) Only (iii) is correct
(b) (i) and (ii) are correct
(c) Only(ii) is correct
(d) None is correct

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