The thermally most stable compound is:

Which of the following elements exhibits the most basic character?

Which of the following is the correct order of reactivity of halogens with alkali?

Which of the following halogens is most easily reduced?

Given below are two statements: Statement $(I)$: Oxidising power of halogens decreases in the order $F_2 > Cl_2 > Br_2 > I_2$,which is the basis of "Layer test". Statement $(II)$: "Layer test" to identify $Br_2$ and $I_2$ in aqueous solution involves the oxidation of bromide or iodide into $Br_2$ or $I_2$ respectively with $Cl_2$,which is a type of displacement redox reaction. In the light of the above statements,choose the correct answer from the options given below:

Hydrofluoric acid $(HF)$ cannot be stored in glass bottles because it reacts with glass $(SiO_2)$ to form: