Atomic Structure | First Year Chemistry Past Paper MCQs | mosaicbro.com

Atomic Structure | First Year Chemistry Past Paper MCQs

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29 Bohr's model of atom is contradicted by:
Correct Answer: C
Explanation: Bohr's fixed orbits violate Heisenberg's uncertainty in position/momentum.
30 K-series X-Rays have wavelength:
Correct Answer: D
Explanation: K-series X-rays vary by element (λ ∝ 1/Z² per Moseley's law).
31 What is the value of (n + l) for the 3s sub-shell?
Correct Answer: D
Explanation: For 3s: n=3, l=0 ⇒ n + l = 3 (used in Aufbau ordering).
32 Cathode rays consist of:
Correct Answer: A
Explanation: Cathode rays are streams of electrons emitted from a cathode.
33 The d-subshell consists of:
Correct Answer: A
Explanation: d-subshell (l=2) has 5 orbitals (mₗ = -2, -1, 0, +1, +2).
34 Orbitals having same energy are called:
Correct Answer: D
Explanation: Degenerate orbitals (e.g., 3pₓ, 3pᵧ, 3p_z) have identical energy.
35 Positive rays were discovered by:
Correct Answer: D
Explanation: Goldstein observed canal rays (positive ions) in 1886.
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