The frequency v of certain line of the Lyman series of the atomic spectrum of hydrogen satisfies the following conditions:

(i) It is the sum of the frequencies of another Lyman line and a Balmer line.

(ii) It is the sum of the frequencies of a certain line, a Lyman line, and a Paschen line.

(iii)It is the sum of the frequencies of a Lyman and a Paschen line but no Bracket line. To what transition does v correspond?

(1) n2=3 to n1=1

(2) n2=3 to n1=2

(3) n2=2 to n1=1

(4) n2=4 to n1=1

Subtopic:  Hydrogen Spectra |
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The number of nodal planes in a px-orbital is :

1.  1

2.  2

3.  3

4.  zero 

Subtopic:  Nodal Plane |
 63%
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The number of electrons in an atom with atomic number 105 having (n+1) = 8 are:

1.  30

2.  17

3.  15

4.  Unpredictable 

Subtopic:  Number of Electron, Proton & Neutron |
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Out of the first 100 elements, number of elements having electrons in 3d-orbitals are :

1.  80

2.  10

3.  100

4.  60

Subtopic:  AUFBAU Principle |
 56%
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Which are in the ascending order of wavelength?

(1) Hα, Hβ, Hγ...lines in Balmer series of hydrogen atom

(2) Lyman limit, balmer limit, paschen limit in the hydrogen spectrum

(3) Blue, violet, yellow, red colours in solar spectrum

(4) None of the above

Subtopic:  Hydrogen Spectra |
 59%
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Photoelectric emission is observed from a surface for frequency  and v2 of the incident radiation . If the maximum kinetic energies of the photoelectrons in the two cases are in the ratio  then the threshold frequency  is given by :


(1) 

(2) 

(3) 

(4) 

Subtopic:  Photo Electric Effect |
 61%
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Which of the following pairs of d-orbitals will have electron density along the axes?

1. dz2,dxz

2. dxz,dyz

3. dz2,dx2-y2

4. dxy,dx2-y2

Subtopic:  Shell & Subshell |
 77%
From NCERT
NEET - 2016
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What is the maximum numbers of electrons that can be associated with the following set

of quantum numbers?

n=3, l = 1 and m=-1

1. 10

2. 6

3. 4

4. 2

 

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 72%
From NCERT
NEET - 2013
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The maximum number of electrons in a subshell with l = 3 and n = 4 is

1. 14

2. 16

3. 10

4. 12

Subtopic:  Shell & Subshell |
 81%
From NCERT
NEET - 2012
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Which one of the following ions has electronic configuration [Ar]3d6?

(At. no: Mn = 25, Fe = 26, Co = 27, Ni =28)

1. Ni3+               

2. Mn3+

3. Fe3+               

4. Co3+

Subtopic:  AUFBAU Principle |
 79%
From NCERT
NEET - 2010
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