\( \mathrm{NaCl} \) reacts with conc. \( \mathrm{H_2SO_4} \) and \( \mathrm{K_2Cr_2O_7} \) to give reddish fumes \( (B) \), which react with \( \mathrm{NaOH} \) to give yellow solution \( (C) \). \( (B) \) and \( (C) \) respectively are:
\( \mathrm{Na_2CrO_4} \), \( \mathrm{CrO_2Cl_2} \)
\( \mathrm{CrO_2Cl_2} \), \( \mathrm{KHSO_4} \)
\( \mathrm{CrO_2Cl_2} \), \( \mathrm{Na_2Cr_2O_7} \)
\( \mathrm{CrO_2Cl_2} \), \( \mathrm{Na_2CrO_4} \)
