Which of the following sets of quantum numbers represent an impossible arrangement -
n l m s
1. 3 2 -2 (+)1/2
2. 4 0 0 (-)1/2
3. 3 2 -3 (+)1/2
4. 5 3 0 (-)1/2
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyHow many unpaired electrons are present in Ni2+ cation (atomic number = 28)
1. 0
2. 2
3. 4
4. 6
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyNumber of unpaired electrons in 1s2 2s2 2p3 is -
1. 2
2. 0
3. 3
4. 1
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe quantum numbers of four electrons are given below.
n m s
(1) Electron 1 3 0 0 -1/2
(2) Electron 2 4 0 0 1/2
(3) Electron 3 3 2 0 1/2
(4) Electron 4 3 1 0 -1/2
The correct order of decreasing energy of these electrons is -
1. Electron 3 > Electron 1 > Electron 4> Electron 2
2. Electron 4> Electron 2 > Electron 3 > Electron 1
3. Electron 3 > Electron 2 > Electron 4 > Electron 1
4. Electron 2 > Electron 4 > Electron 3 > Electron 1
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich type of radiation is not emitted by the electronic structure of atoms:
1. Ultraviolet light
2. X-rays
3. Visible light
4. y-rays
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn absorption line of the lowest frequency in the transition of hydrogen spectra is
1. n=1 to n=2
2. n=3 to n=8
3. n=2 to n=1
4. n=8 to n=3
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIf uncertainty in the position of an electron is zero the uncertainty in its momentum will be
(1) < h/4
(2) > h/4
(3) zero
(4) infinite
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe maximum number of atomic orbitals associated with a principal quantum number 5 is-
1. 9
2. 12
3. 16
4. 25
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe de Broglie wavelength of electron of He+ ion is 3.329Å. If the photon emitted upon de-excitation of this He+ ion is made to hit H atom in its ground state so as to liberate electron from it, what will be the de Broglie's wavelength of photoelectron ?
1. 0.1518 Å
2. 6.1518 Å
3. 2.3518 Å
4. 4.1218 Å
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyVelocity of helium atom at 300 K is 2.40 x 102 meter per sec. What is its wavelength? (mass number of helium is 4) -
1. 0.416 nm
2. 0.83 nm
3. 803 Å
4. 8000 Å
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology