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Enthalpy

Which one of ...

Question

Which one of the following pairs is obtained on heating ammonium dichromate?

N_{2}

and

H_{2}

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H_{2}

O and

H_{2}

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N O_{2}

and

H_{2}

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NO and

N O_{2}

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Solution

The correct option is A $N_{2}$ and $H_{2}$ O
On heating ammonium dichromate; $N_{2}$ , $H_{2} O$ and $C r_{2} O_{3}$ are formed.
$(N H_{4})_{2} C r_{2} O_{7} (s) ⟶ N_{2} (g) + 4 H_{2} O (g) + C r_{2} O_{3} (s) Δ H = - 429 k c a l / m o l$

Option (A) is correct.

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M

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