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

Atomic Structure | First Year Chemistry Past Paper MCQs

7 of 44 questions (Page 3 of 7)

Filter by Category

15 Bombardment of α-particles on Beryllium (Be) atom emits neutron and this process is called:
Correct Answer: B
Explanation: ⁹Be + α → ¹²C + n; this induced transmutation is artificial radioactivity.
16 Balmer series in hydrogen spectrum lies in the region:
Correct Answer: B
Explanation: Balmer series (n→2) emits visible light (e.g., Hα at 656 nm).
17 The value of Planck's constant is:
Correct Answer: A
Explanation: Planck's constant (h) = 6.626 × 10⁻³⁴ J·s.
18 Properties of waves are:
Correct Answer: D
Explanation: Waves are characterized by λ (wavelength), ν (frequency), and wave number (1/λ).
19 Which equation correctly represents Heisenberg's uncertainty principle?
Correct Answer: C
Explanation: Heisenberg's principle: Δx Δp ≥ ħ/2 (where ħ = h/2π).
20 ⁶⁵Cu + ¹n → ⁶⁶Cu + 'x'. What is 'x'?
Correct Answer: D
Explanation: Neutron capture emits γ-rays: ⁶⁵Cu + n → ⁶⁶Cu + γ.
21 The number of neutrons present in ³⁹K is:
Correct Answer: C
Explanation: ³⁹K has 19 protons and 20 neutrons (39 - 19 = 20).
MCQs Bank by mosaicbro.com