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

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Which of the following statements is/are correct?
(1) When a Lassaigne's solution is heated with dil.
P
\( \mathrm{HNO}_{3} \), cooled, and \( \mathrm{AgNO}_{3} \) solution is added, a
W.
yellow precipitate, partially soluble in \( \mathrm{NH}_{3} \) or \( \mathrm{NH}_{4} \mathrm{OH} \), indicates the presence of iodine in organic compound.
(2) When \( \left(\mathrm{CH}_{3} \mathrm{COO}\right)_{2} \mathrm{~Pb} \) solution is added to the acidified Lassaigne's extract of an organic compound, a black precipitate of \( \mathrm{PbS} \) is formed.
(3) An organic compound containing \( \mathrm{N} \), on heating with conc. \( \mathrm{H}_{2} \mathrm{SO}_{4} \) gives \( \left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4} \) which liberates \( \mathrm{NH}_{3} \) on treatment with excess of \( \mathrm{NaOH} \).
(4) The molecular mass of a non-volatile organic compound is determined either by Dumas method or by VIctor Meyer's method.


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