Atomic Structure · JEE Main previous year questions

2012 3 questions

1. Q622012 · 26 May 2012 · Shift 1

   The following sets of quantum numbers represent four electrons in an atom. (i) $n=4,l=1$ (ii) $n=4,l=0$ (iii) $n=3,l=2$ (iv) $n=3,l=1$ The sequence representing increasing order of energy, is

   1. A.(iii) < (i) < (iv) < (ii)
   2. B.(iv) < (ii) < (iii) < (i)
   3. C.(i) < (iii) < (ii) < (iv)
   4. D.(ii) < (iv) < (i) < (iii)
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   Answer: B

2. Q632012 · 12 May 2012 · Shift 1

   If the radius of first orbit of H atom is $a_0$, the de Broglie wavelength of an electron in the third orbit is

   1. A.$4\pi a_0$
   2. B.$8\pi a_0$
   3. C.$6\pi a_0$
   4. D.$2\pi a_0$
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   Answer: C

3. Q632012 · 7 May 2012 · Shift 1

   The limiting line in Balmer series will have a frequency of (Rydberg constant, $R_{\infty }=3.29\times 10^{15}cycles/s$)

   1. A.$8.22\times 10^{14}{\mathrm{s}}^{-1}$
   2. B.$3.29\times 10^{15}{\mathrm{s}}^{-1}$
   3. C.$3.65\times 10^{14}{\mathrm{s}}^{-1}$
   4. D.$5.26\times 10^{13}{\mathrm{s}}^{-1}$
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   Answer: A