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(X)overset(KOH)to (Y) (gas turns red lit...

`(X)overset(KOH)to (Y)` (gas turns red litmus blue)+`(Z)overset(Zn+KOH)to(Y)` (gas).
`(X)overset(Delta)to` gas (does not support combustion) identify (X) to (Z):

A

`X=NH_(4)NO_(2)" "Y=NH_(3)" "Z=KNO_(2)`

B

`X=(NH_(4))_(2)Cr_(2)O_(7)" "Y=NH_(3)" "Z=K_(2)SO_(4)`

C

`X=NH_(4)NO_(3)" "Y=NH_(3)" "Z=KNO_(3)`

D

none of these

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