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Which of the following statement is fals...

Which of the following statement is false.
(1) Kjeldhal's method is used for estimation of N-element in organic compounds.
(2) Carius method is used for Estimation of N-element.
(3) Carius method is used for estimation of sulphur in organic compounds.
(4)Phosphorous is present in organic compound is oxidized to `H_3PO_4` then precipitated by magnesia mixture in form of `Mg_2P_2_O_7`.

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