Match List I with List II

Choose the correct answer from the options given below:

(A)-(IV), (B)-(III), (C)-(I), (D)-(II)

The correct answer is option 3. (A)-(IV), (B)-(III), (C)-(I), (D)-(II).

Let's break down each compound and its corresponding property:

A. \(XeF_6\) (Xenon hexafluoride): Xenon hexafluoride has a distorted octahedral geometry. In this molecule, xenon is surrounded by six fluorine atoms, leading to an octahedral arrangement. However, due to the presence of lone pairs on the xenon atom, the geometry is distorted from a perfect octahedron.

B. Liquid Helium: Liquid helium, particularly helium-4 (\(^4He\)), exhibits unique properties at low temperatures, including superfluidity. Superfluidity is a state of matter where a fluid flows without friction, essentially showing zero viscosity. This property makes liquid helium thermodynamically unstable under certain conditions, particularly at very low temperatures.

C. \(HNO_2\) (Nitrous acid): Nitrous acid undergoes a disproportionation reaction, where it decomposes into nitric acid (\(HNO_3\)) and nitric oxide (\(NO\)).

D. \(O_3\) (Ozone): Ozone (\(O_3\)) is used in magnetic resonance imaging (MRI) as a contrast agent. Ozone can be infused into the bloodstream to enhance the visibility of certain tissues or organs during MRI scans.

Therefore, each compound in List I has a unique property or characteristic as listed in List II:

A - IV (Distorted octahedral)
B - III (MRI)
C - I (Disproportionation reaction)
D - II (Thermodynamically unstable)