Which of the following statements is incorrect ?

Options

A. Ammonium salts on reaction with strong alkalies produce a non`-` inflamable gas.
B. fac`- [Co(NO_(3))_(2)("dien")]` is non`-` chiral.
C. Solid potassium dichromate and concentrated `H_(2)SO_(4)` liberates chlorine gas with solid sodium chloride.
D. The increasing order of paramagnetic properties amongst `VCl_(3),VOSO_(4),Na_(3)VO_(4),[V(H_(2)O)_(6)]SO_(4).H_(2)O` is `Na_(3)VO_(4) lt VOSO_(4) lt VCl_(3) lt [V(H_(2)O)_(6)]SO_(4).H_(2)O.`

Answer

3

Explanation

`(1)" "NH_(4)^(+)+OH^(-)rarrNH_(3)uarr +H_(2)O`
`(2)` The statements is correct, non`-` chiral because there is mirror plane through the metal bisecting the dien ligant.
`(3)" "4Cl^(-)(s)+Cr_(2)O_(7)^(2-)(s)+6H^(+)("conc.")rarr2CrO_(2)Cl_(2)uarr("deep red")+3H_(2)O(l)`
`(4)" "VCl_(3),._(23)V^(3+),[Ar]^(18)3d^(2)=2` unpaired electrons.
`VO^(2+),V^(4+),[Ar]^(18)3d^(2)=1` unpaired electron.
`[VO_(4)]^(3-),V^(5+),[Ar]^(18)3d^(0)=` no unpaired electron.
`[V(H_(2)O)_(6)]^(2+),V^(2+):[Ar]^(18)3d^(3)=3` unpaired electrons.