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

Atomic Structure | First Year Chemistry Past Paper MCQs

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1 Maximum number of electrons in a subshell is given by:
Correct Answer: C
Explanation: A subshell can hold up to 2(2l+1) electrons, where l is the azimuthal quantum number.
2 An orbital can accommodate maximum electrons:
Correct Answer: D
Explanation: Each orbital can hold a maximum of 2 electrons with opposite spins.
3 How many times the mass of neutron is greater than that of electron?
Correct Answer: D
Explanation: Neutron mass ≈ 1840 × electron mass (1.675 × 10⁻²⁷ kg vs 9.109 × 10⁻³¹ kg).
4 Lyman Series is obtained when electron in an atom jumps from higher energy level to:
Correct Answer: A
Explanation: Lyman series results from transitions to n=1 (ground state), emitting UV radiation.
5 When 6d orbital is complete, the entering electron goes into:
Correct Answer: C
Explanation: After 6d, electrons fill 7p according to the Aufbau principle (n+l rule).
6 Lyman series occur in:
Correct Answer: B
Explanation: Lyman series (n→1) emits ultraviolet (UV) radiation.
7 Value for positive rays is maximum for:
Correct Answer: A
Explanation: Hydrogen ions (H⁺) in positive rays have the highest charge-to-mass ratio (e/m).
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