`HCOONa overset(350^(@))underset(Delta) to Gas(X) + Residue (Y)overset(CoCl_(3)) to "Complex" (Z)`
Complex (Z) is:

Options

A. an outer orbital complex
B. optically active
C. oxidised when exposed to air
D. paramagnetic

Answer

B

Explanation

`HCOONaunderset(Delta)overset(350^(@)C)rarrH_(2)(X)+NaC_(2)O_(4)(Y)overset(CoCl_(3))rarrNa_(3)[Co(C_(2)O_(4))_3](Z)`
(i) `"Gas" (X) to H_(2)`
-It is diamagnetic
-B.O.=1
-It acts as `pi`-acid (into `sigma_(1s)^(**))`
(ii) `Na_(3)[Co(C_(2)O_(4))_3]`
`[M(AA)_(3)]`

Optically active