Which of the following statements are true?

(A) Noble gases have low m.p. or b.p. due to weak dispersion forces

(B) All noble gases have completely filled \(ns^2np^6\) electronic configuration

(C) \(XeF_2\) and \(XeF_6\) are colourless crystalline solid

(D) \(XeO_3\) has pyramidal geometry

Choose the correct answer from the options given below:

(A), (B), (C), (D) only

The correct answer is (A), (B), (C), (D) only.

Statement (A) is true. Noble gases have low melting and boiling points because of the weak dispersion forces between their atoms. Dispersion forces are the weakest type of intermolecular force, and they only exist between nonpolar molecules. Noble gases are all nonpolar molecules, so they only have dispersion forces to hold them together.
Statement (B) is true. All noble gases have a completely filled ns²np⁶ electronic configuration. This is because noble gases have a full valence shell, which makes them very stable and unreactive.
Statement (C) is true. XeF₂ and XeF₆ are colorless crystalline solids. This is because xenon is a large atom with a high polarizability, which means that it can be easily distorted by the fluorine atoms. When the fluorine atoms pull on the xenon atom, it creates a dipole, which allows the xenon fluoride molecules to form attractive intermolecular forces.
Statement (D) is true. XeO₃ has a pyramidal geometry. This is because the xenon atom in XeO₃ has four valence electrons, and three of them are used to bond to the three oxygen atoms. The fourth valence electron is a lone pair, which pushes the three oxygen atoms down into a pyramidal shape.