Mark the incorrect statement in nitrogen Kjeldahl's method of estimation

CHEMISTRY · Single correct · CBSE · Chemistry · Organic Chemistry - Some Basic Principles and Techniques · Organic Chemistry - Some Basic Principles and Techniques

Problem

Mark the incorrect statement in nitrogen Kjeldahl's method of estimation (1) Nitrogen gas is collected over caustic potash solution (2) Potassium sulphate is used as boiling point elevator of H2SO4\text{H}_2\text{SO}_4 (3) Copper sulphate or mercury acts as a catalyst (4) Nitrogen is quantitatively decomposed to give ammonium sulphate

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