# Incorrect statement among the following is:  1. The uncertainty principle is$$\Delta x \cdot \Delta p \geq \frac{h}{4 \pi}$$ 2. Half-filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry, and a more balanced arrangement. 3. The energy of the 2s orbital is less than the energy of the 2p orbital in the case of hydrogen-like atoms. 4. De-Broglie's wavelength is given by$$\lambda=\frac{h}{m v}$$, where m= mass of the particle, v = group velocity of the particle.

Subtopic:  De Broglie Equation |
68%
From NCERT
NEET - 2017
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A pair of d-orbitals having electron density along the axes is:

1. ${d}_{{z}^{2}},$ ${d}_{xz}$

2. ${d}_{xz},$ ${d}_{zy}$

3. ${d}_{{z}^{2}},$ ${d}_{{x}^{2}-{y}^{2}}$

4. ${d}_{xy},$ ${d}_{{x}^{2}-{y}^{2}}$

Subtopic:  Shell & Subshell |
83%
From NCERT
NEET - 2016
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The incorrect statement among the following is:

 1 Total orbital angular momentum of an electron in 's' orbital is equal to zero. 2 An orbital is designated by three quantum numbers, while an electron in an atom is designated by four quantum numbers. 3 The electronic configuration of N atom is 4 The value of m for dz2 is zero.
Subtopic:  AUFBAU Principle |
79%
From NCERT
NEET - 2018
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The number of d-electrons in Fe2+ (Z = 26) is not equal to the number of:
1. s-electrons in Mg (Z = 12)
2. p-electrons in Cl (Z = 17)
3. d-electrons in Fe (Z = 26)
4. p-electrons in Ne (Z = 10)

Subtopic:  AUFBAU Principle |
64%
From NCERT
NEET - 2015
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The angular momentum of electrons in d orbital is equal to:
1. $\sqrt{6}$ $\overline{)h}$
2. $\sqrt{2}$$\overline{)h}$
3. $2\sqrt{3}$ $\overline{)h}$
4. 0 $\overline{)h}$

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
77%
NEET - 2015
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The correct set of four quantum numbers for the valence electron of a rubidium atom (Z =37) is:

 1 $$5,1,1,+ {1 \over2}$$ 2 $$6,0,0,+ {1 \over2}$$ 3 $$5,0,0,+ {1 \over2}$$ 4 $$5,1,0,+ {1 \over2}$$
Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
80%
From NCERT
AIPMT - 2012
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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. $\mathrm{ns}$ $\stackrel{}{\to }$ $\left(\mathrm{n}-2\right)$ $\mathrm{f}$ $\stackrel{}{\to }$ $\left(\mathrm{n}-1\right)$ $\mathrm{d}$ $\stackrel{}{\to }$ $\mathrm{np}$

Subtopic:  AUFBAU Principle |
64%
From NCERT
AIPMT - 2011
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The rule used to determine the maximum number of electrons in a subshell of an atom is:

 1 4l+2 2 2l+1 3 4l-2 4 2n2
Subtopic:  Shell & Subshell |
67%
From NCERT
AIPMT - 2009
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The incorrect set of quantum numbers among the following is:

1. n= 4, l= 0, m= 0, s= -1/2
2. n= 5, l= 3, m= 0, s= +1/2
3. n= 3, l= 2, m= -3, s= -1/2
4. n= 3, l= 2, m= 2, s= -1/2

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
86%
From NCERT
AIPMT - 2009
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The orbital diagram in which both Pauli's exclusion principle and Hund's rule are violated is:

1.

2.

3.

4.

Subtopic:  Pauli's Exclusion Principle & Hund's Rule |
68%
From NCERT
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