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The compound(s) which generate(s) `N_(2)` gas upon thermal decomposition below `300^(@)C` is (are)

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The compound(s) which generate(s) `N_(2)` gas upon thermal decomposition below `300^(@)C` is (are)
A. `NH_(4)NO_(3)`
B. `(NH_(4))_(2)Cr_(2)O_(7)`
C. `Ba(N_(3))_(2)`
D. `Mg_(3)N_(2)`
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Correct Answer - B::C
`NH_(4)NO_(3)` on heating gives `N_(2)O` while `Mg_(3)N_(2)` does not decompose below `300^(@)C`. Thus, `(NH_(4))_(2)Cr_(2)O_(7)andBa[N_(3)]_(2)` on thermal decomposition give `N_(2)` i.e., options (b,c) are correct.
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