$NaCl + K_2Cr_2O_7 + \text{conc. } H_2SO_4$ $\xrightarrow{\Delta} P(\text{gas})$ $\xrightarrow{NaOH} Q$ $\xrightarrow[Pb(CH_3COO)_2]{CH_3COOH} R(\text{ppt})$
Which of the following is the correct statement?

  • A
    $P$ is a yellow-coloured gas
  • B
    $Q$ is an orange-red solution
  • C
    $R$ is a yellow precipitate $(ppt)$
  • D
    None of these

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