The zone refining of metal is based on the principle of

On heating quick lime with coke in an electric furnace, we get

$29.5\, mg$ of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia was absorbed in $20\, mL$ of $0.1\, M\, HCl$ solution. The excess of the acid required $15 \,mL$ of $0.1\, M \,NaOH$ solution for complete neutralization. The percentage of nitrogen in the compound is ……… $\%$

Which is not correctly matched

Given below are two statements.

Statement $I$ : Pig iron is obtained by heating cast iron with scrap iron.

Statement $II$: Pig iron has a relatively lower carbon content than that of cast iron. In the light of the above statements, choose the correct answer from the options given below.