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

Which one of the following elemental forms is not present in the enamel of the teeth?

How is $H_2S$ liberated in the laboratory?

An oxide of an element is a gas and dissolves in water to give an acidic solution. The element belongs to:

The stability of dihalides of $Si, Ge, Sn$ and $Pb$ follows the sequence.

Identify the correct statements from the following:
$(a)$ $CO_{2(s)}$ (dry ice) is used as a refrigerant for ice-cream and frozen food.
$(b)$ The structure of $C_{60}$ contains $20$ six-membered rings and $12$ five-membered rings.
$(c)$ $ZSM-5$,a type of zeolite,is used to convert alcohols into gasoline.
$(d)$ $CO$ is a colorless and odorless gas.