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`(NH_(4))_(2)Cr_(2)O_(7)` on heating gives a gas which is also given by :

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`(NH_(4))_(2)Cr_(2)O_(7)` on heating gives a gas which is also given by :
A. heating `NH_(4)NO_(2)`
B. heating `NH_(4)NO_(3)`
C. treating `Mg_(3)N_(2)` with water
D. heating `H_(2)O_(2) and NaNO_(2)`
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`(NH_(4))_(2)Cr_(2)O_(7) overset(Delta)rarr Cr_(2)O_(3)+N_(2)+H_(2)O`
`NH_(4)NO_(2)overset(Delta)rarr N_(2)+H_(2)O`
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