# The circumference of the Bohr orbit for the H atom is related to the de Broglie wavelength associated with the electron revolving around the orbit by the following relation:  $1.$ $2\mathrm{\pi r}=\mathrm{n\lambda }$ $2.$ $\mathrm{\pi r}$ $=$ $2\mathrm{n\lambda }$ $3.$ $\mathrm{mvr}$ $=$ $\mathrm{n\lambda }$ $4.$ $\mathrm{vr}$ $=$ $2\mathrm{n\lambda }$

Subtopic:  Bohr's Theory | De Broglie Equation |
80%
From NCERT
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Which among the following are isoelectronic species?

1.

2.

3.

4. None of the above

Subtopic:  Number of Electron, Proton & Neutron |
74%
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The neon gas emits radiation of 616 nm. The number of quanta that are present in 2 J of energy is:

$1.$ $6.2$ $×$ ${10}^{-18}$
$2.$ $5.6$ $×$ ${10}^{17}$
$3.$ $6.2$ $×$ ${10}^{18}$
$4.$ $32.2$ $×$ ${10}^{-20}$


Subtopic:  Planck's Theory | Electromagnetic Radiation |
70%
From NCERT
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The atomic number of elements whose outermost electronic configuration are represented by 3s1 and 2p5 respectively, is:

 1 9, 7 2 9, 11 3 11, 5 4 11, 9

Subtopic:  Introduction of Atomic Structure |
78%
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The number of electrons that can be present in the subshells having ms value of $$-\frac{1}{2}$$ for n = 4 are:

1. 36

2. 4

3. 16

4. 2

Subtopic:  Shell & Subshell |
73%
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Among the given options, the element having the highest number of unpaired electrons in the ground state is

1. P

2. Fe

3. Kr

4. Cr

Subtopic:  Pauli's Exclusion Principle & Hund's Rule |
67%
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The unpaired electrons in Al and Si are present in the 3p orbital. The electrons that will experience a more effective nuclear charge from the nucleus are :

1. Electrons in the 3p orbital of silicon

2. Electrons in the 5d orbital of aluminium

3. Electrons in the 3p orbital of aluminium

4. Electrons in the 5p orbital of silicon

Subtopic:  Number of Electron, Proton & Neutron |
54%
From NCERT
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The electron of a Br atom that experiences the lowest effective nuclear charge is:

1. 2p and 3p

2. 4p

3. 2p

4. 3p

Subtopic:  Number of Electron, Proton & Neutron |
73%
From NCERT
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If the position of the electron were measured with an accuracy of +0.002 nm, the uncertainty in the momentum of the electron would be:

1. 5.637 × 10–23 kg m s–1

2. 4.637 × 10–23 kg m s–1

3. 2.637 × 10–23 kg m s–1

4. 3.637 × 10–23 kg m s–1

Subtopic:  Heisenberg Uncertainty Principle |
72%
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When a photon with a wavelength of 150 pm strikes an atom, one of its inner bound electrons is ejected at a velocity of 1.5 × 107 m s–1 The energy with which it is bound to the nucleus would be:

1. 32.22 × 10–16 J

2. 12.22 × 10–16 J

3. 22.27 × 10–16 J

4. 31.22 × 10–16 J

Subtopic:  Photo Electric Effect |
70%
From NCERT
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