MCQ
Among the following basic oxide is .....
- A$SO _{3}$
- B$SiO _{2}$
- ✓$CaO$
- D$Al _{2} O _{3}$
$CaO =$ Basic
$Al _{2} O _{3}=$ Amphoteric
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
$B$ is


$PhCHO + Ph \cdot CHO \xrightarrow[in\,\,{{D}_{2}}O]{NaOD} A + \begin{matrix} O \\ || \\ Ph-C-{{O}^{-}} \\ \end{matrix}$$\left( Ph\right.$ is $\left.- C _{6} H _{5}\right)$