JEE Advanced 2024 · Paper 1 · Chemistry Q5

ChemistryMultiple correct+4 / -2Question 39 of 51

Among the following, the correct statement(s) for electrons in an atom is(are)

Uncertainty principle rules out the existence of definite paths for electrons.

The energy of an electron in

2s

orbital of an atom is lower than the energy of an electron that is infinitely far away from the nucleus.

According to Bohr's model, the most negative energy value for an electron is given by

n = 1

, which corresponds to the most stable orbit.

According to Bohr's model, the magnitude of velocity of electrons increases with increase in values of

n

Answer and worked solution

Official answer: A, B, C

(A) True: by the uncertainty principle, position and momentum cannot both be exact, so there are no definite trajectories.
(B) True: a bound electron has negative energy, lower than the zero energy of an electron at infinity.
(C) True: $E_n \propto -\frac{1}{n^2}$ is most negative at $n = 1$ , the most stable orbit.
(D) False: $v_n \propto \frac{Z}{n}$ , so the speed decreases as $n$ increases.

JEE Advanced 2024 · Paper 1, Chemistry question 5