Which of the following compounds is used in cosmetic surgery?

Hydrolysis of which of the following carbides does not take place?

Identify the incorrect order against the stated property.

Carbon and silicon both belong to group $14$, but despite the stoichiometric similarity, their dioxides (i.e., carbon dioxide and silicon dioxide) differ in their structures. Comment.

Which fibrous mineral substance can withstand red-hot temperatures without being damaged?

Explain the following reactions:
$(a)$ Silicon is heated with methyl chloride at high temperature in the presence of copper;
$(b)$ Silicon dioxide is treated with hydrogen fluoride;
$(c)$ $CO$ is heated with $ZnO$;
$(d)$ Hydrated alumina is treated with aqueous $NaOH$ solution.