Which of the following does not give oxygen on heating?
(IIT-JEE, 2013)

K_{2} C r_{2} O_{7}

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(N H_{4})_{2} C r_{2} O_{7}

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K C l O_{3}

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Z n (C l O_{3})_{2}

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Solution

The correct option is B $(N H_{4})_{2} C r_{2} O_{7}$
$(N H_{4})_{2} C r_{2} O_{7}$ on heating gives $N_{2 (g)} .$
$(N H_{4})_{2} C r_{2} O_{7} △ \to N_{2} + C r_{2} O_{3} + 4 H_{2} O$
whereas compounds is (a), (c) and (d) all gives oxygen on heating.
(a) $4 K_{2} C r_{2} O_{7} △ \to 4 K_{2} C r O_{4} + 2 C r_{2} O_{3} + 3 O_{2}$
When $K_{2} C r_{2} O_{7}$ is heated it decomposes with the evolution of $O_{2} .$
(c) $2 K C l O_{3} △ \to 2 K C l + 3 O_{2} (g)$
Potassium chlorate
(d) $Z n (C l O_{3})_{2} △ \to Z n C l_{2} + 3 O_{2} (g)$
Zinc chlorate

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