`E+D darr overset(H_(2)O)larr B overset(P)larr Ca overset(N_(2))rarr A overset(H_(2)O)rarr C darr +E`
When gas C is passed through bleaching powder suspension, another gas F comes out, which is not obtained by
A. heating `NH_(4)NO_(3)`
B. heating `NH_(4)NO_(2)`
C. heating `(NH_(4))_(2) Cr_(2)O_(7)`
D. heating `Ba(N_(3))_(2)`