In the lassaigne,s test for nitrogen in an organic compound,the Prussian blue colour is obtained due to formation of

a)Na4 [fe(CN)6]      b) Fe4[fe(CN)6]3   c)Fe2 [fe(CN)6]    d) Fe3 [fe(CN)6]3

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 b) Fe4[fe(CN)6]3  

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