Standard Books Chemistry Bohr's Model MCQ Question with Solution

According to Bohr's theory, the wave number of last line of Balmer series is (R = 1.1 × 10⁷ m⁻¹)

A

5.5 × 10⁵ m⁻¹

B

4.4 × 10⁷ m⁻¹

C

2.75 × 10⁶ m⁻¹

D

2.75 × 10⁸ m⁻¹

Option C

For last line of Balmer series, n₁ = 2 and n₂ = ∞. Using the formula for wave number, we get 1/λ = R(1/n₁² - 1/n₂²) = 1.1 × 10⁷/4 = 2.75 × 10⁶ m⁻¹.

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STANDARD Chemistry Bohr's Model MCQ Question