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Which of the following does not give oxygen on heating?

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${({NH}_{4})}_{2} {Cr}_{2} O_{7}$

$Zn {({ClO}_{3})}_{2}$

${KClO}_{3}$

$K_{2} {Cr}_{2} O_{7}$

answer is D.

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Detailed Solution

${({NH}_{4})}_{2} {Cr}_{2} O_{7} \overset{Δ}{⟶} N_{2} + {Cr}_{2} O_{3} + 4 H_{2} O$

Chlorates and dichromates give oxygen on heating, except when it is ammonium dichromate.
$2 {KClO}_{3} \overset{Δ}{⟶} 2 KCl + 3 O_{2}$
$Zn {({ClO}_{3})}_{2} \overset{Δ}{⟶} {ZnCl}_{2} + 3 O_{2}$

$4 K_{2} {Cr}_{2} O_{7} \overset{Δ}{⟶} 4 K_{2} {CrO}_{4} + 2 {Cr}_{2} O_{3} + 3 O_{2}$

In ${({NH}_{4})}_{2} {Cr}_{2} O_{7}; \overset{+}{{NH}_{4}}$ is reducing agent ${Cr}_{2} {O_{7}}^{2 -}$ is oxidasing agent.

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