Which compounds are taken in the Kjeldahl's flask for the estimation of nitrogen?
- ACompound $+$ conc. $H_2SO_4 + CuSO_4$
- BCompound $+$ conc. $HNO_3 + CuSO_4$
- CCompound $+$ conc. $H_2SO_4 + NaOH$
- DCompound $+$ conc. $HCl + CuSO_4$
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