MCQ
Boric acid is acid because its molecule:
- AContamp replaceable $H^+$.
- BGives up proton.
- ✓Accepts $\ce{OH^-}$ from water and releases proton.
- DCombines with proton from water molecule.
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$(A)$ Hydrated $Al _2 O _3$ precipitates, when $CO _2$ is bubbled through a solution of sodium aluminate.
$(B)$ Addition of $Na _3 AlF _6$ lowers the melting point of alumina.
$(C)$ $CO _2$ is evolved at the anode during electrolysis.
$(D)$ The cathode is a steel vessel with a lining of carbon.