Atomic Structure · JEE Main previous year questions

2024 31 questions

1. Q702024 · 29 Jan 2024 · Shift 1

   The correct set of four quantum numbers for the valence electron of rubidium atom ($Z=37$) is :

   1. A.$5,1,1,+\frac{1}{2}$
   2. B.$5,0,0,+\frac{1}{2}$
   3. C.$5,0,1,+\frac{1}{2}$
   4. D.$5,1,0,+\frac{1}{2}$
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   Answer: B

2. Q862024 · 29 Jan 2024 · Shift 2· Numerical answer

   The total number of anti bonding molecular orbitals, formed from $2s$ and $2p$ atomic orbitals in a diatomic molecule is _________.

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   Answer: 4

3. Q652024 · 27 Jan 2024 · Shift 1

   Which of the following electronic configuration would be associated with the highest magnetic moment?

   1. A.$[\text{Ar}]3{\text{ d}}^7$
   2. B.$[\text{Ar}]3{\text{ d}}^8$
   3. C.$[\text{Ar}]3{\text{ d}}^3$
   4. D.$[\text{Ar}]3{\text{ d}}^6$
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   Answer: D

4. Q802024 · 27 Jan 2024 · Shift 1

   The electronic configuration for Neodymium is: [Atomic Number for Neodymium 60]

   1. A.$[\text{Xe}]4{\text{f}}^{4}6{\text{ s}}^2$
   2. B.$[\text{Xe}]5{\text{f}}^{4}7{\text{ s}}^2$
   3. C.$[\text{Xe}]4{\text{f}}^{6}6{\text{ s}}^2$
   4. D.$[\text{Xe}]4{\text{f}}^{1}5{\text{ d}}^{1}6{\text{ s}}^2$
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   Answer: A

5. Q882024 · 27 Jan 2024 · Shift 1· Numerical answer

   The number of electrons present in all the completely filled subshells having $n=4$ and $s=+\frac{1}{2}$ is _______. (Where $n=$ principal quantum number and $s=$ spin quantum number)

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   Answer: 16

6. Q752024 · 27 Jan 2024 · Shift 2

   Choose the correct option having all the elements with ${\text{d}}^{10}$ electronic configuration from the following :

   1. A.${}^{46}\text{Pd},{}^{28}\text{Ni},{}^{26}\text{Fe},{}^{24}\text{Cr}$
   2. B.${}^{29}\text{Cu},{}^{30}\text{Zn},{}^{48}\text{Cd},{}^{47}\text{Ag}$
   3. C.${}^{27}\text{Co},{}^{28}\text{Ni},{}^{26}\text{Fe},{}^{24}\text{Cr}$
   4. D.${}^{28}\text{Ni},{}^{24}\text{Cr},{}^{26}\text{Fe},{}^{29}\text{Cu}$
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   Answer: B