Which of the following statements is/are correct ?

Options

A. When a Lassaigne's solution is heated with dil. `HNO_(3)`, cooled and `AgNO_(3)` solution is added, a `NH_(4)OH`, indicates the presence of iodine in organic compound.
B. When `(CH_(3)COO)_(4)` pb solution is added to the acidified Lassaigne's extract of an organic compound, a black precipitate of PbS is formed.
C. An organic compound containing N, on heating with conc. `H_(2)SO_(4)` gives `(NH_(4))_(2)SO_(4)` which liberates `NH_(3)` on treatment with excess of NaOH.
D. The molecular mass of non - volatile organic compound is determined either by Dumas method or by Vector Meyer's method.

Answer

B, C

Explanation

It is called empirical formula.