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Which of the following statements is/are correct? This question has multiple correct options

1. Liebig's method is used for the quantitative estimation of both \( C \) and \( H \)
2. Dumas method is used for the quantitative estimation of \( \mathrm{N} \) in all nitrogen-containing organic compounds.
3. In Liebig's combustion method, dry CuO is used.
4. Silver salt method is a chemical method for the determination of equivalent mass of organic acids.

Correct answer: Liebig's method is used for the quantitative estimation of both \( C \) and \( H \)

Solution

Liebig's combustion method is specifically designed to determine carbon and hydrogen quantitatively by converting them into CO2 and H2O, respectively. The other statements are incorrect as written: Dumas is for nitrogen estimation, but not in all nitrogen-containing compounds without exceptions; dry CuO is used in combustion analysis, and silver salt method is not the standard method for equivalent mass of organic acids.

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