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Class 11 Chemistry — Chapter 2: Structure of Atom
90 practice questions · 30 Easy · 30 Medium · 30 Hard
Free NCERT-aligned multiple-choice practice for Class 11 Chemistry, Chapter 2 (Structure of Atom). Practise timed Easy, Medium and Hard quizzes with instant explanations — built for CBSE Board exams, JEE Main and NEET UG. Here are a few sample questions; sign in free to practise all 90.
Sample questions
Q1Easy
Charge on a proton:
A.+1.6×10⁻¹⁹ C✓ correct
B.−1.6×10⁻¹⁹ C
C.0
D.+1 C
Why
Positive elementary charge.
Q2Medium
Wavenumber for H transition n₂ → n₁: ν̄ = R(1/n₁² − 1/n₂²). For Lyman first line:
A.R(1 − 1/4)✓ correct
B.R(1/4 − 1/9)
C.R(1 − 1/9)
D.R(1/9 − 1/16)
Why
n₂=2 → n₁=1: R(1 − 1/4) = 3R/4.
Q3Hard
Ratio of radii of 2nd Bohr orbit of He⁺ to 1st Bohr orbit of H:
A.2 : 1✓ correct
B.4 : 1
C.1 : 2
D.1 : 1
Why
r ∝ n²/Z; (4/2)/(1/1) = 2.
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