Refer to the flow chart diagram below and give balanced equations with conditions, if any, for the following conversions A to D.

Explanation

A. `NaCl + underset("Conc.")(H_2SO_4) overset(Delta" "200^@C)to Na_2SO_4 + underset("Hydrogen chloride")(HCl uarr) `
B. `2HCl(g) + Fe rarr underset(underset("chloride")("Iron (II)"))(FeCl_2) + H_2 uarr`
C. `HCl(g) + NH_3(g) rarr underset("Ammonium chloride")(NH_4Cl)`
D. `underset("dil.")(2HCl) + underset("aq.")(Pb(NO_3)_2) rarr underset("Lead chloride")(PbCl_2 darr) + 2HNO_3`