Which of the following statements is/are wrong?....

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Which of the following statements is/are wrong?
P
(1) Sulphur is estimated by Liebig's method
(2) Victor Meyer's method is used for the determination of molecular mass of a nonvolatile compound.
(3) Kjeldahl's method is used for all nitrogencontaining organic compounds.
(4) Phosphorous is estimated by Carius method as \( \mathrm{Mg}\left(\mathrm{NH}_{4}\right) \cdot \mathrm{PO}_{4} \).


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