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JEE Main Chemistry Structure of Atom 2026 JEE Main 2026 (21 January Shift 1)

JEE Main Chemistry Question (2026) — Solution

Question

Given below are two statements : Statement I : When an electric discharge is passed through gaseous hydrogen, the hydrogen molecules dissociate and the energetically excited hydrogen atoms produce electromagnetic radiation of discrete frequencies. Statement II : The frequency of second line of Balmer series obtained from He ^ + is equal to that of first line of Lyman series obtained from hydrogen atom. In the light of the above statements, choose the correct answer from the options given below :

Options

  1. A. Statement I is false but Statement II is true
  2. B. Both Statement I and Statement II are true
  3. C. Statement I is true but Statement II is false
  4. D. Both Statement I and Statement II are false

Answer

B. Both Statement I and Statement II are true

Step-by-step solution

Statement I: Electric discharge through H_2 causes dissociation into excited H atoms which emit discrete frequencies (line spectrum). This is true. Statement II: Using = RcZ^2 ( 1 n_1^2 - 1 n_2^2 ) For He^+ (Z=2), second Balmer line (n_1=2, n_2=4): = 4Rc ( 1 4 - 1 16 ) = 3Rc 4 For H (Z=1), first Lyman line (n_1=1, n_2=2): = Rc (1 - 1 4 ) = 3Rc 4 Both frequencies are equal. Statement II is true. Both statements are true.

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