MCQ
In potassium atom, electronic energy level is in the following order
- A$4s > 3d$
- B$4s < 2p$
- ✓$4s < 3d$
- D$4s > 4p$
The $(n+1)$ Value of $'4s'$ orbital is lower than that of $'3d'$ orbital.
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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 :-