Which compounds are taken in the Kjeldahl's flask for the estimation of nitrogen?

  • A
    Compound $+$ conc. $H_2SO_4 + CuSO_4$
  • B
    Compound $+$ conc. $HNO_3 + CuSO_4$
  • C
    Compound $+$ conc. $H_2SO_4 + NaOH$
  • D
    Compound $+$ conc. $HCl + CuSO_4$

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