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If the electronic structure of oxygen atom is written as $1{\mathrm{s}}^2, 2{\mathrm{s}}^2$  it would violate
1.  Hund's rule
2.  Paulis exclusion principle
3.  Both Hund's and Pauli's principles
4.  None of the above

If n = 6, the correct sequence for the filling of electrons will be: 
1. $\mathrm{ns}$ $\stackrel{}{\to }$ $\left(\mathrm{n}-1\right)$ $\mathrm{d}$ $\stackrel{}{\to }$ $\left(\mathrm{n}-2\right)$ $\mathrm{f}$ $\stackrel{}{\to }$ $\mathrm{np}$
2. $\mathrm{ns}$ $-$ $\left(\mathrm{n}-2\right)$ $\mathrm{f}$ $\stackrel{}{\to }$ $\mathrm{np}$ $\stackrel{}{\to }$ $\left(\mathrm{n}-1\right)$ $\mathrm{d}$
3. $\mathrm{ns}$ $-$ $\mathrm{np}$ $\stackrel{}{\to }$ $\left(\mathrm{n}-1\right)\mathrm{d}$ $\stackrel{}{\to }$ $\left(\mathrm{n}-2\right)$ $\mathrm{f}$
4. $\mathrm{ns}$ $\stackrel{}{\to }$ $\left(\mathrm{n}-2\right)$ $\mathrm{f}$ $\stackrel{}{\to }$ $\left(\mathrm{n}-1\right)$ $\mathrm{d}$ $\stackrel{}{\to }$ $\mathrm{np}$

The magnetic moment of 2.84 BM can be shown by:  
(At. no. Ni = 28, Ti = 22, Cr = 24, Co = 27)
1. Ni²⁺
2. Ti³⁺
3. Cr³⁺
4. Co²⁺

The electronic configurations of Eu (Atomic no. 63), Gd (Atomic no. 64) and Tb (Tb Atomic no. 65) are
1. [Xe]4f⁶5d¹6s², [Xe]4f⁷5d¹6s² and [Xe]4f⁹6s²
2. [Xe]4f⁶5d¹6s², [Xe]4f⁷5d¹6s² and [Xe]4f⁸5d¹6s²
3. [Xe]4f⁷6s², [Xe]4f⁷5d¹6s² and [Xe]4f⁹6s²
4. [Xe]4f⁷6s², [Xe]4f⁸6s² and [Xe]4f⁸5d¹6s² 

The group number and electronic configuration of  element Z =114 is: 
1. Halogen family, [Rn]5f¹⁴6d¹⁰7s²7p⁵
2. Carbon family, [Rn]5f¹⁴6d¹⁰7s²7p²
3. Oxygen family, [Rn]5f¹⁴6d¹⁰7s²7p⁴
4. Nitrogen family, [Rn]5f¹⁴6d¹⁰7s²7p⁶

Which one is the wrong statement?

How many unpaired electrons are present in Ni²⁺ cation (atomic number = 28)
1. 0
2. 2
3. 4
4. 6

Isodiaphers among the following options is :
1.  ${}_6{}^{14}C$ and ${}_{11}{}^{23}N$ 
2.  ${}_{12}{}^{24}Mg$  and ${}_{11}{}^{23}C$ 
3.  ${}_2{}^{4}He$  and ${}_8{}^{16}O$ 
4.  ${}_6{}^{12}C$  and ${}_7{}^{15}N$  

The number of electrons in  ₁₉ K with quantum numbers n=3; l=0 is/are
1. 2
2. 1
3. 4
4. 3

Which of the following has greater number of electrons than neutrons?
1. Al³⁺
2. O^2-
3. F^-
4. C

The maximum number of electrons in a subshell with l = 3 and n = 4 is
1. 14
2. 16
3. 10
4. 12

The angular momentum of an electron in d orbital is equal to
1. $\sqrt{6} \sout{\mathrm{h}}$
2. $\sqrt{2} \mathrm{h}$
3. $2\sqrt{3} \mathrm{h}$
4. 0 h

Which of the following pairs of d-orbitals will have electron density along the axes?
1. d_z²,d_xz
2. d_xz,d_yz
3. d_z²,d_x²-y²
4. d_xy,d_x²-y²

A photon of wavelength 300 nm causes the emission of two photons. If the wavelength of one of them is 700 nm. What is the wavelength of the other photon?
1. 525 nm
2. 600 nm
3. 450 nm
4. 300 nm