Mark the incorrect statement in Kjeldahls method of estimation of nitrogen (a) copper sulphate o...

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Mark the incorrect statement in Kjeldahls method of estimation of nitrogen
(a) copper sulphate or mercury acts as a catalyst.
(b) nitrogen is quantitatively decomposed to give ammonium sulphate.
(c) nitrogen gas is collected over caustic potash solution.
(d) potassium sulphate is used as boiling point elevator of \( \mathrm{H}_{2} \mathrm{SO}_{4} \).
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