Atomic Structure · JEE Main previous year questions

2006 3 questions

1. Q982006 · 29 Apr 2006 · Shift 1

   According to Bohr's theory, the angular momentum of an electron in $5^{\mathrm{th}}$ orbit is

   1. A.$10h/\pi$
   2. B.$2.5h/\pi$
   3. C.$25h/\pi$
   4. D.$1.0h/\pi$
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   Answer: B

2. Q992006 · 29 Apr 2006 · Shift 1

   Uncertainty in the position of an electron ($\mathrm{mass}=9.1\times 10^{-31}\mathrm{kg}$) moving with a velocity $300\mathrm{m}{\mathrm{s}}^{-1}$, accurate up to $0.001\%$ will be ($h=6.63\times 10^{-34}\mathrm{Js}$)

   1. A.$1.92\times 10^{-2}\mathrm{m}$
   2. B.$3.84\times 10^{-2}\mathrm{m}$
   3. C.$19.2\times 10^{-2}\mathrm{m}$
   4. D.$5.76\times 10^{-2}\mathrm{m}$
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   Answer: A

3. Q1262006 · 29 Apr 2006 · Shift 1

   The “spin-only” magnetic moment [in units of Bohr magneton, (${\mu }_{\mathrm{B}}$)] of $\mathrm{N}{\mathrm{i}}^{2+}$ in aqueous solution would be : (Atomic number of Ni = 28)

   1. A.$2.84$
   2. B.$4.90$
   3. C.$0$
   4. D.$1.73$
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   Answer: A