Which of the following does not give oxygen on heating?

Which of the following does not give oxygen on heating?
  1. \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\)
  2. \(\left(\mathrm{NH}_{4}ight)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\)
  3. \(\mathrm{KClO}_{3}\)
  4. \(\mathrm{Zn}\left(\mathrm{ClO}_{3}ight)_{2}\)

Solution

$$
2 \mathrm{KClO}_{3} ightarrow 2 \mathrm{KCl}+3 \mathrm{O}_{2} \uparrow
$$
$$
2 \mathrm{Zn}\left(\mathrm{ClO}_{3}ight)_{2} ightarrow \mathrm{ZnCl}_{2}+3 \mathrm{O}_{2} \uparrow
$$
$$
4 \mathrm{~K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} ightarrow 4 \mathrm{~K}_{2} \mathrm{CrO}_{4}+2 \mathrm{Cr}_{2} \mathrm{O}_{3}+3 \mathrm{O}_{2} \uparrow
$$
$$
\left(\mathrm{NH}_{4}ight)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} ightarrow \mathrm{Cr}_{2} \mathrm{O}_{3}+4 \mathrm{H}_{2} \mathrm{O}+\mathrm{N}_{2} \uparrow
$$
All the given compounds are oxygen-rich. All of them, except ammonium dichromate $\left[\left(\mathrm{NH}_{4}ight)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}ight]$, give oxygen on heating. Ammonium dichromate, on the other hand, gives nitrogen on heating. ~

Asked in: JEE-TOPICTESTS-CHEMISTRY

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