Question

Which of the following noble gas molecules is more polarised by water?

• A. Krypton
• B. Helium
• C. Argon
• D. Neon

Hint:

Greater atomic size and more electrons lead to higher polarizability.

Answer 1

The Correct Option is A

Step 1: Understand polarisation.
Polarisation of an atom or molecule depends on the size of its electron cloud and the ease with which it can be distorted by an external electric field.
Step 2: Compare noble gases.
Among noble gases, polarizability increases down the group due to increasing atomic size and number of electrons.
Step 3: Analyze the options.
Helium and neon are very small atoms and are least polarizable. Argon is larger than neon but smaller than krypton. Krypton has the largest atomic size among the given options.
Step 4: Conclusion.
Krypton is most easily polarised by water among the given noble gases.