Which of the following statements is/are correct, when a mixture of `NaCl` and `K_2Cr_2O_7` is gently warmed with concentrated `H_2SO_4`?

Which of the following statement(s) is/are correct when a mixture of NaCl and K_(2)Cr_(2)O_(7) is genetly warmed with conc. H_(2)SO_(4) ?

Which of the following statements are correct when a mixture of NaCl and K_2Cr_2O_7 is generally warmed with conc. H_2SO_4 ?

Which of the following statement(s) is (are) correct when. a mixture of NaCl and K_2Cr_2O_7 is gently warmed with conc. H_2SO_4 ?

Which of the following statement (s) is (are) correct when a mixture of NaCl and K_(2)Cr_(2)O_(7) is gently warmed with conc. H_(2)SO_(4) ?