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

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Which of the following statements is/are wrong?
(1) Beilstein test is a reliable test for halogens in
\( \mathrm{P} \)
organic compounds
W
(2) In Lassaigne's test for N, Prussian blue colour is due to the formation of ferro-ferri cyanide.
(3) When \( \mathrm{FeCl}_{3} \) solution is added to the Lassaigne's extract, a blue solution is obtained, which indicates the presence of both \( \mathrm{N} \) and \( \mathrm{S} \).
(4) Molecular mass of an acid = Equivalent mass acidity.


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