Correct Answer - D
The radial probability distribution function for the `1s` orbital of the `H` atom initially increases with increase in distance form the nucleus. It reaches a maximum at a distance very close to the nucleus and then decreases. The maixmum in the curve corresponds to the distance at which the probability of finding the electron is the maximum. This distance, called the radius of maximum probability, for `H` atom has a value of `52.9 pm`. For `2s` orbital, ot os `275 pm` and for `2p`, it is `210 pm`.
