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NEET 2013

Exam: NEET
Year: 2013
Subject: Chemistry
Chapter: p Block Elements (Group 15, 16, 17 & 18)

NEET 2013 · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Which of the following does not give oxygen on heating?

Which of the following does not give oxygen on heating?

Options

A $\mathrm{KClO}_3$
B $\mathrm{Zn}\left(\mathrm{ClO}_3\right)_2$
C $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$
D $\left(\mathrm{NH}_4\right)_2 \mathrm{Cr}_2 \mathrm{O}_7$

Correct answer

D. $\left(\mathrm{NH}_4\right)_2 \mathrm{Cr}_2 \mathrm{O}_7$

Step-by-step solution

Oxygen rich compounds like chlorate perchlorate

\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7

etc., when heated gives oxygen but ammonium dichromate gives nitrogen gas when heated.

\begin{gathered} 2 \mathrm{KClO}_3 \stackrel{\Delta}{\longrightarrow} 2 \mathrm{KCl}+3 \mathrm{O}_2 \uparrow \\ 2 \mathrm{Zn}\left(\mathrm{ClO}_3\right)_2 \stackrel{\Delta}{\longrightarrow} \mathrm{ZnCl}_2+3 \mathrm{O}_2 \\ 4 \mathrm{~K}_2 \mathrm{Cr}_2 \mathrm{O}_7 \stackrel{\Delta}{\longrightarrow} 4 \mathrm{~K}_2 \mathrm{CrO}_4+2 \mathrm{Cr}_2 \mathrm{O}_3+3 \mathrm{O}_2 \uparrow \\ \left(\mathrm{NH}_4\right)_2 \mathrm{Cr}_2 \mathrm{O}_7 \stackrel{\Delta}{\longrightarrow} \mathrm{N}_2 \uparrow+\mathrm{Cr}_2 \mathrm{O}_3+4 \mathrm{H}_2 \mathrm{O} \end{gathered}

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