MCQ
In which case, the order of acidic strength is not correct ?
- A$HI > HBr > HCl$
- B$HIO_4 > HBrO_4 > HClO_4$
- C$HClO_4 > HClO_3 > HClO_2$
- ✓$HF > H_2O > NH_3$
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$(A)$ $\left[ FeF _{6}\right]^{3-}$
$(B)$ $\left[ Fe ( CN )_{6}\right]^{3-}$
$(C)$ $\left[ MnCl _{6}\right]^{3-}$ (high spin)
$(D)$ $\left[ Mn ( CN )_{6}\right]^{3-}$

Assertion $A :$- Carbon forms two important oxides $- CO$ and $CO _2 . CO$ is neutral whereas $CO _2$ is acidic in nature.
Reason $R :$- $CO _2$ can combine with water in a limited way to form carbonic acid, while $CO$ is sparingly soluble in water.
In the light of the above statements, choose the most appropriate answer from the options given below :-