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Enthalpy of Combustion

When NH42 C...

Question

When $(N H_{4})_{2} C r_{2} O_{7}$ is heated $C r_{2} O_{3}$ is produced as a produnct and some other by product are also produced. What is the type of reaction?

Combustion

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Decomposition

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Redox

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Disproportionation

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Solution

The correct option is C Redox
$(N H_{4})_{2} C r_{2} O_{7} Δ \to N_{3} + C r_{2} O_{3} + 4 H_{2} O$ .
It is a redox reaction. $N H_{4}^{+}$ ion is oxidised to $N_{2}$ , while $C r_{2} O_{7}^{2 -}$ ion is reduced to $C r^{3 +}$ .

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