The COD of water sample is determined using

The COD of water sample is determined using
  1. $50 \% \mathrm{H}_2 \mathrm{SO}_4, \mathrm{~K}_2 \mathrm{Cr}_2 \mathrm{O}_7$
  2. $50 \% \mathrm{NaOH}, \mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$
  3. $50 \% \mathrm{CH}_3 \mathrm{COOH}, \mathrm{KMnO}_4$
  4. $50 \% \mathrm{H}_2 \mathrm{SO}_4, \mathrm{FeSO}_4$

Solution

No solution. Refer to answer key.

Asked in: AP EAMCET 2017 (26 Apr Shift 2)

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