Question 1: Palette 1/60

NEET 2026 MCQ

$ \text { Match List I with List II : } $

	List I (Quantum Numbers)			List II (Orbital)
	'n'	'I'
A.	2	1	I.	3d
B.	4	0	II.	2p
C.	5	3	III.	4s
D.	3	2	IV.	5f

Choose the correct answer from the options given below.

A

A-IV, B-II, C-III, D-I

B

A-II, B-III, C-I, D-IV

C

A-II, B-III, C-IV, D-I

D

A-I, B-II, C-III, D-IV

Question 2: Palette 2/60

NEET 2026 MCQ

A bulb is rated at 150 watt, converting $8 \%$ energy into light. If energy of one photon is $4.42 \times 10^{-19} \mathrm{~J}$, how many photons are emitted by the bulb per second?

A

$2.71 \times 10^{19}$

B

$4.06 \times 10^{19}$

C

$27.2 \times 10^{19}$

D

$1.35 \times 10^{19}$

Question 3: Palette 3/60

NEET 2026 MCQ

$ \text { Consider the following schematic plots of orbital wavefunction }\left(\psi_r\right) \text { against distance }(r) \text { from the nucleus. } $

The figure representing two radial nodes in the orbital is

A

D

B

A

C

B

D

C

Question 4: Palette 4/60

NEET 2025 MCQ

The ratio of the wavelengths of the light absorbed by a Hydrogen atom when it undergoes $n=2 \rightarrow n=3$ and $n=4 \rightarrow$ $\mathrm{n}=6$ transitions, respectively, is

A

$\frac{1}{9}$

B

$\frac{1}{4}$

C

$\frac{1}{36}$

D

$\frac{1}{16}$

Question 5: Palette 5/60

NEET 2025 MCQ

Energy and radius of first Bohr orbit of $\mathrm{He}^{+}$and $\mathrm{Li}^{2+}$ are [Given $\mathrm{R}_{\mathrm{H}}=2.18 \times 10^{-18} \mathrm{~J}, \mathrm{a}_0=52.9 \mathrm{pm}$ ]

A

$\begin{aligned} & \mathrm{E}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=-19.62 \times 10^{-16} \mathrm{~J} ; \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=17.6 \mathrm{pm} \\ & \mathrm{E}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=-8.72 \times 10^{-16} \mathrm{~J} ; \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=26.4 \mathrm{pm} \end{aligned}$

B

$\begin{aligned} & \mathrm{E}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=-8.72 \times 10^{-16} \mathrm{~J} ; \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=17.6 \mathrm{pm} \\ & \mathrm{E}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=-19.62 \times 10^{-16} \mathrm{~J} ; \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=17.6 \mathrm{pm} \end{aligned}$

C

$\begin{aligned} & \mathrm{E}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=-19.62 \times 10^{-18} \mathrm{~J} ; \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=17.6 \mathrm{pm} \\ & \mathrm{E}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=-8.72 \times 10^{-18} \mathrm{~J} ; \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=26.4 \mathrm{pm} \end{aligned}$

D

$\begin{aligned} & \mathrm{E}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=-8.72 \times 10^{-18} \mathrm{~J} ; \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=26.4 \mathrm{pm} \\ & \mathrm{E}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=-19.62 \times 10^{-18} \mathrm{~J} ; \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=17.6 \mathrm{pm} \end{aligned}$

Question 6: Palette 6/60

NEET 2024 MCQ

The quantum numbers of four electrons are given below :

I. $n=4 ; I=2 ; m_1=-2 ; s=-\frac{1}{2}$

II. $n=3 ; I=2 ; m_1=1 ; s=+\frac{1}{2}$

III. $n=4 ; I=1 ; m_1=0 ; s=+\frac{1}{2}$

IV. $n=3 ; I=1 ; m_1=-1 ; s=+\frac{1}{2}$

The correct decreasing order of energy of these electrons is

A

IV $>$ II $>$ III $>$ I

B

I $>$ III $>$ II $>$ IV

C

III $>$ I $>$ II $>$ IV

D

I $>$ II $>$ III $>$ IV

Question 7: Palette 7/60

NEET 2024 MCQ

Given below are two statements:

Statement I: The Balmer spectral line for H atom with lowest energy is located at $\frac{5}{36} R_H \mathrm{~cm}^{-1}$.

($\mathrm{R}_{\mathrm{H}}=$ Rydberg constant)

Statement II: When the temperature of blackbody increases, the maxima of the curve (intensity and wavelength) shifts to shorter wavelength.

In the light of the above statements, choose the correct answer from the options given below:

A

Statement I is true but Statement II is false

B

Statement I is false but Statement II is true

C

Both Statement I and Statement II are true

D

Both Statement I and Statement II are false

Question 8: Palette 8/60

NEET 2024 MCQ

The energy of an electron in the ground state $\mathrm{(n=1)}$ for $\mathrm{He}^{+}$ ion is $\mathrm{-x} \mathrm{~J}$, then that for an electron in $\mathrm{(n=2)}$ state for $\mathrm{Be}^{3+}$ ion in $\mathrm{J}$ is

A

$-x$

B

$-\frac{x}{9}$

C

$-4 x$

D

$-\frac{4}{9} x$

Question 9: Palette 9/60

NEET 2024 MCQ

Match List I with List II.

	List I (Quantum Number)		List II (Information provided)
A.	$\mathrm{m_l}$	I.	Shape of orbital
B.	$\mathrm{m_s}$	II.	Size of orbital
C.	I	III.	Orientation of orbital
D.	n	IV.	Orientation of spin of electron

Choose the correct answer from the options given below :

A

A-I, B-III, C-II, D-IV

B

A-III, B-IV, C-I, D-II

C

A-III, B-IV, C-II, D-I

D

A-II, B-I, C-IV, D-III

Question 10: Palette 10/60

NEET 2023 MCQ

Incorrect set of quantum numbers from the following is :

A

$\mathrm{n}=4,1=3, \mathrm{~m}_1=-3,-2,-1,0,+1,+2,+3, \mathrm{~m}_{\mathrm{s}}=-1 / 2$

B

$\mathrm{n}=5,1=2, \mathrm{~m}_1=-2,-1,+1,+2, \mathrm{~m}_{\mathrm{s}}=+1 / 2$

C

$\mathrm{n}=4,1=2, \mathrm{~m}_1=-2,-1,0,+1,+2, \mathrm{m}_{\mathrm{s}}=-1 / 2$

D

$\mathrm{n}=5,1=3, \mathrm{~m}_1=-3,-2,-1,0,+1,+2,+3, \mathrm{m_s}=+1 / 2$

Question 11: Palette 11/60

NEET 2023 MCQ

Given below are two statements:

Statement I : The value of wave function, $\psi $ depends upon the coordinates of the electron in the atom.

Statement II : The probability of finding an electron at a point within an atom is proportional to the orbital wave function.

In the light of the above statements, choose the correct answer from the options given below:

A

Statement I is true but Statement II is false.

B

Statement I is false but Statement II is true.

C

Both Statement I and Statement II are true.

D

Both Statement I and Statement II are false.

Question 12: Palette 12/60

NEET 2023 MCQ

Select the correct Statements from the following :

A. Atoms of all elements are composed of two fundamental particles.

B. The mass of the electron is $9.10939 \times 10^{-31} \mathrm{~kg}$.

C. All the isotopes of a given elements show same chemical properties.

D. Protons and electrons are collectively known as nucleons.

E. Dalton's atomic theory, regarded the atom as an ultimate particle of matter.

Choose the correct answer from the options given below.

A

C, D and E only

B

A and E only

C

B, C and E only

D

A, B and C only

Question 13: Palette 13/60

NEET 2023 MCQ

The relation between $\mathrm{n}_{\mathrm{m}},\left(\mathrm{n}_{\mathrm{m}}=\right.$ the number of permissible values of magnetic quantum number $(\mathrm{m})$) for a given value of azimuthal quantum number $(l)$, is

A

$l=2 \mathrm{n}_{\mathrm{m}}+1$

B

$\mathrm{n}_{\mathrm{m}}=2 l^{2}+1$

C

$\mathrm{n}_{\mathrm{m}}=l+2$

D

$l=\frac{\mathrm{n}_{\mathrm{m}}-1}{2}$

Question 14: Palette 14/60

NEET 2022 MCQ

Match List-I with List-II :

	List-I (quantum number)		List-II (orbital)
(a)	n = 2, l = 1	(i)	2s
(b)	n = 3, l = 2	(ii)	3s
(c)	n = 3, l = 0	(iii)	2p
(d)	n = 2, l = 0	(iv)	3d

Choose the correct answer from the options given below :

A

(a) - (iii), (b) - (iv), (c) - (ii), (d) - (i)

B

(a) - (iii), (b) - (iv), (c) - (i), (d) - (ii)

C

(a) - (iv), (b) - (iii), (c) - (i), (d) - (ii)

D

(a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)

Question 15: Palette 15/60

NEET 2022 MCQ

When electromagnetic radiation of wavelength 300 nm falls on the surface of a metal, electrons are emitted with the kinetic energy of 1.68 $\times$ 10⁵ J mol^$-$1. What is the minimum energy needed to remove an electron from the metal?

(h = 6.626 $\times$ 10^$-$34 Js, c = 3 $\times$ 10⁸ ms^$-$1, N_A = 6.022 $\times$ 10²³ mol^$-$1)

A

2.31 $\times$ 10⁵ J mol^$-$1

B

2.31 $\times$ 10⁶ J mol^$-$1

C

3.84 $\times$ 10⁴ J mol^$-$1

D

3.84 $\times$ 10^$-$19 J mol^$-$1

Question 16: Palette 16/60

NEET 2022 MCQ

Identify the incorrect statement from the following.

A

All the five 5d orbitals are different in size when compared to the respective 4d orbitals.

B

All the five 4d orbitals have shapes similar to the respective 3d orbitals.

C

In an atom, all the five 3d orbitals are equal in energy in free state.

D

The shapes of d_xy, d_yz and d_zx orbitals are similar to each other; and d_{x² $-$ y²} and d_z² are similar to each other.

Question 17: Palette 17/60

NEET 2022 MCQ

If radius of second Bohr orbit of the He⁺ ion is 105.8 pm, what is the radius of third Bohr orbit of Li²⁺ ion?

A

158.7 pm

B

15.87 pm

C

1.587 pm

D

158.7 $\mathop A\limits^o $

Question 18: Palette 18/60

NEET 2021 MCQ

A particular station of All India Radio, New Delhi broadcasts on a frequency of 1,368 kHz (kilohertz). The wavelength of the electromagnetic radiation emitted by the transmitter is : [speed of light c = 3.0 $\times$ 10⁸ ms^$-$1]

A

21.92 cm

B

219.3 m

C

219.2 m

D

2192 m

Question 19: Palette 19/60

NEET 2021 MCQ

From the following pairs of ions which one is not an iso-electronic pair?

A

Fe²⁺, Mn²⁺

B

O^2$-$, F^$-$

C

Na⁺, Mg²⁺

D

Mn²⁺, Fe³⁺

Question 20: Palette 20/60

NEET 2019 MCQ

Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region?

A

Paschen series

B

Brackett series

C

Lyman series

D

Balmer series

Question 21: Palette 21/60

NEET 2019 MCQ

4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is :

A

6p > 5f > 4d > 5p

B

5f > 6p > 4d > 5p

C

5f > 6p > 5p > 4d

D

6p > 5f > 5p > 4d

Question 22: Palette 22/60

NEET 2018 MCQ

Which one is a wrong statement?

A

Total orbital angular momentum of electron in s-orbital is equal to zero.

B

An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantum numbers

C

The electronic configuration of N atom is

D

The value of m for dz² is zero.

Question 23: Palette 23/60

NEET 2017 MCQ

Which one is the wrong statement ?

A

The uncertainty principle is

$\Delta E \times \Delta t \ge {h \over {4\pi }}$

B

Half filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement.

C

The energy of 2s-orbital is less than the energy of 2p-orbital in case of hydrogen like atoms.

D

de-Broglie's wavelength is given by

$\lambda = {h \over {mv}}$, where m = mass of the particle,

v $=$ group velocity of the particle.

Question 24: Palette 24/60

NEET 2016 MCQ

Which of the following pairs of d-orbitals will have electron density along the axes ?

A

${d_{{z^2}}},\,\,{d_{xz}}$

B

d_xz,  ${d_{yz}}$

C

${d_{{z^2}}},\,\,{d_{{x^2} - {y^2}}}$

D

${d_{xy}},\,{d_{{x^2} - {y^2}}}$

Question 25: Palette 25/60

NEET 2016 MCQ

How many electrons can fit in the orbital for which n = 3 and $l$ = 1?

A

2

B

6

C

10

D

14

Question 26: Palette 26/60

NEET 2016 MCQ

Two electrons occupying the same orbital are distinguished by

A

azimuthal quantum number

B

spin quantum number

C

principal quantum number

D

magnetic quantum number

Question 27: Palette 27/60

NEET 2015 MCQ

Which is the correct order of increasing energy of the listed orbitals in the atom of titanium ? (At. no. Z = 22)

A

4s 3s 3p 3d

B

3s 3p 3d 4s

C

3s 3p 4s 3d

D

3s 4s 3p 3d

Question 28: Palette 28/60

NEET 2015 MCQ

The angular momentum of electron in 'd' orbital is equal to

A

$2\sqrt 3 h$

B

0 $\hbar $

C

$\sqrt 6 \,\hbar $

D

$\sqrt 2 \,\hbar $

Question 29: Palette 29/60

NEET 2015 MCQ

The number of d-electrons in Fe²⁺ (Z = 26) is not equal to the number of electrons in which one of the following ?

A

d-electrons in Fe (Z = 26)

B

p-electrons in Ne (Z = 10)

C

s-electrons in Mg (Z = 12)

D

p-electrons in Cl(Z = 17)

Question 30: Palette 30/60

NEET 2014 MCQ

What is the maximum number of orbitals that can be identified with the following quantum numbers ?
n = 3, l = 1, m₁ = 0

A

1

B

2

C

3

D

4

Question 31: Palette 31/60

NEET 2014 MCQ

Be²⁺ is isoelectronic with which of the following ions ?

A

H⁺

B

Li⁺

C

Na⁺

D

Mg²⁺

Question 32: Palette 32/60

NEET 2014 MCQ

Calculate the energy in joule corresponding to light of wavelength 45 nm. (Planck,s constant, h = 6.63 $ \times $ 10^$-$34 J s, speed of light, c = 3 $ \times $ 10⁸ m s^$-$1)

A

6.67 $ \times $ 10¹⁵

B

6.67 $ \times $ 10¹¹

C

4.42 $ \times $ 10^$-$15

D

4.42 $ \times $ 10^$-$18

Question 33: Palette 33/60

NEET 2013 MCQ

According to law of photochemical equivalence the energy absorbed (in ergs/mole) is given as (h = 6.62 $ \times $ 10^$-$27 ergs, c = 3 $ \times $ 10¹⁰ cm s^$-$1, N_A = 6.02 $ \times $ 10^$-$23 mol^$-$1)

A

${{1.196 \times {{10}^8}} \over \lambda }$

B

${{2.859 \times {{10}^5}} \over \lambda }$

C

${{2.859 \times {{10}^{16}}} \over \lambda }$

D

${{1.196 \times {{10}^{16}}} \over \lambda }$

Question 34: Palette 34/60

NEET 2013 MCQ

The outer electronic configuration of Gd (At. No. 64) is

A

4f⁵ 5d⁴ 6s¹

B

4f⁷ 5d¹ 6s²

C

4f³ 5d⁵ 6s²

D

4f⁴ 5d⁵ 6s¹

Question 35: Palette 35/60

NEET 2013 MCQ

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

A

4

B

2

C

10

D

6

Question 36: Palette 36/60

NEET 2013 MCQ

Based on equation E = $-$ 2.178 $ \times $ 10^$-$18 J $\left( {{{{Z^2}} \over {{n^2}}}} \right)$, certain conclusions are written. Which of them is not correct ?

A

Equation can be used to calculate the change in energy when the electron changes orbit.

B

For n = 1, the electron has a more negative energy than it does for n = 6 which means that the electron is more loosely bound in the smallest allowed orbit.

C

The negative sign in equation simply means that the energy of electron bound to the nucleus is lower than it would be if the electrons were at the infinite distance from the nucleus.

D

Larger the value of n, the larger is the orbit radius.

Question 37: Palette 37/60

NEET 2013 MCQ

The value of Planck's constant is 6.63 $ \times $ 10^$-$34 J s. The speed of light is 3 $ \times $ 10¹⁷ mm s^$-$1. Which value is closest to the wavelength in nanometer of a quantum of light with frequency of 6 $ \times $ 10¹⁵ s^$-$1 ?

A

50

B

75

C

10

D

25

Question 38: Palette 38/60

NEET 2012 MCQ

The orbital angular momentum of a p-electron is given as

A

${h \over {\sqrt 2 \pi }}$

B

$\sqrt 3 {h \over {2\pi }}$

C

$\sqrt {{3 \over 2}} {h \over \pi }$

D

$\sqrt 6 {h \over {2\pi }}$

Question 39: Palette 39/60

NEET 2012 MCQ

The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is

A

5, 1, 1, + 1/2

B

6, 0, 0, +1/2

C

5, 0, 0, +1/2

D

5, 1, 0, +1/2

Question 40: Palette 40/60

NEET 2012 MCQ

Maximum number of electrons in a subshell with $l$ = 3 and n = 4 is

A

14

B

16

C

10

D

12

Question 41: Palette 41/60

NEET 2011 MCQ

According to the Bohr theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon ?

A

n = 6 to n = 1

B

n = 5 to n = 4

C

n = 6 to n = 5

D

n = 5 to n = 3

Question 42: Palette 42/60

NEET 2011 MCQ

The total number of atomic orbitals in fourth energy level of an atom is

A

8

B

16

C

32

D

4

Question 43: Palette 43/60

NEET 2011 MCQ

The energies E₁ and E₂ of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths i.e., $\lambda $₁ and $\lambda $₂ will be

A

$\lambda $₁ = $\lambda $₂

B

$\lambda $₁ = 2$\lambda $₂

C

$\lambda $₁ = 4$\lambda $₂

D

$\lambda $₁ = ${1 \over 2}$ $\lambda $₂

Question 44: Palette 44/60

NEET 2011 MCQ

If n = 6, the correct sequence for filling of electrons will be

A

$ns \to \left( {n - 2} \right)f \to \left( {n - 1} \right)d \to np$

B

$ns \to \left( {n - 1} \right)d \to \left( {n - 2} \right)f \to np$

C

$ns \to \left( {n - 2} \right)f \to np \to \left( {n - 1} \right)d$

D

$ns \to np\left( {n - 1} \right)d \to \left( {n - 2} \right)f$

Question 45: Palette 45/60

NEET 2010 MCQ

A 0.66 kg ball is moving with a speed of 100 m/s. The associated wavelength will be

(h = 6.6 $ \times $ 10^$-$34 J s)

A

6.6 $ \times $ 10^$-$32 m

B

6.6 $ \times $ 10^$-$34 m

C

1.0 $ \times $ 10^$-$35 m

D

1.0 $ \times $ 10^$-$32 m

Question 46: Palette 46/60

NEET 2009 MCQ

Which of the following is not permissible arrangement of electrons in an atom ?

A

n = 5, $l$ = 3, m = 0, s = +1/2

B

n = 3, $l$ = 2, m = $-$ 3, s = $-$1/2

C

n = 3, $l$ = 2, m = $-$ 2, s = $-$1/2

D

n = 4, $l$ = 0, m = 0, s = $-$1/2

Question 47: Palette 47/60

NEET 2009 MCQ

Maximum number of electrons in a subshell of an atom is determined by the following

A

2$l$ + 1

B

4$l$ $-$ 2

C

2n²

D

4$l$ + 2

Question 48: Palette 48/60

NEET 2008 MCQ

The measurement of the electron position is associated with an uncertainty in momentum, which is equal to 1 $ \times $ 10^$-$18 g cm s^$-$1. The uncertainty in electron velocity is (mass of an electron is 9 $ \times $ 10^$-$28 g)

A

1 $ \times $ 10⁵ cm s^$-$1

B

1 $ \times $ 10¹¹ cm s^$-$1

C

1 $ \times $ 10⁹ cm s^$-$1

D

1 $ \times $ 10⁶ cm s^$-$1

Question 49: Palette 49/60

NEET 2008 MCQ

If uncertainty in position and momentum are equal, then uncertainty in velocity is

A

${1 \over m}\sqrt {{h \over \pi }} $

B

$\sqrt {{h \over \pi }} $

C

${1 \over {2m}}\sqrt {{h \over \pi }} $

D

$\sqrt {{h \over {2\pi }}} $

Question 50: Palette 50/60

NEET 2007 MCQ

Consider the following sets of quantum numbers :

	n		l		m		s
(i)	3		0		0		+1/2
(ii)	2		2		1		+1/2
(iii)	4		3		-2		-1/2
(iv)	1		0		-1		-1/2
(v)	3		2		3		+1/2

Which of the following sets of quantum number is not possible ?

A

(i), (ii), (iii) and (iv)

B

(ii), (iv) and (v)

C

(i) and (iii)

D

(ii), (iii) and (iv)

Question 51: Palette 51/60

NEET 2006 MCQ

The orientation of an atomic orbital is governed by

A

principal quantum number

B

azimuthal quantum number

C

spin quantum number

D

magnetic quantum number.

Question 52: Palette 52/60

NEET 2006 MCQ

Given : The mass of electron is 9.11 $ \times $ 10^$-$31 kg, Planck constant is 6.626 $ \times $ 10^$-$34 J s, the uncertainty involved in the measurement of velocity within a distance of 0.1 $\mathop A\limits^ \circ $ is

A

5.79 $ \times $ 10⁵ m s^$-$1

B

5.79 $ \times $ 10⁶ m s^$-$1

C

5.79 $ \times $ 10⁷ m s^$-$1

D

5.79 $ \times $ 10⁸ m s^$-$1

Question 53: Palette 53/60

NEET 2005 MCQ

The energy of second Bohr orbit of the hydrogen atom is $-$328 kJ mol^$-$1; hence the energy of fourth Bohr orbit would be

A

$-$ 41 kJ mol^$-$1

B

$-$82 kJ mol^$-$1

C

$-$164 kJ mol^$-$1

D

$-$1312 kJ mol^$-$1

Question 54: Palette 54/60

NEET 2004 MCQ

The frequency of radiation emitted when the electron falls from n = 4 to n = 1 in hydrogen atom will be (Given ionization energy of H = 2.18 $ \times $ 10^$-$18 J atom^$-$1 and h = 6.625 $ \times $ 10^$-$34 J s)

A

1.54 $ \times $ 10¹⁵ s^$-$1

B

1.03 $ \times $ 10¹⁵ s^$-$1

C

3.08 $ \times $ 10¹⁵ s^$-$1

D

2.00 $ \times $ 10¹⁵ s^$-$1

Question 55: Palette 55/60

NEET 2003 MCQ

The velocity of Planck's constant is 6.63 $ \times $ 10^$-$34 J s.

The velocity of light is 3.0 $ \times $ 10⁸ m s^$-$1. Which value is closest to the wavelength in nanometers of a quantum of light with frequency of 8 $ \times $ 10¹⁵ s^$-$1 ?

A

2 $ \times $ 10^$-$25

B

5 $ \times $ 10^$-$18

C

$4 \times {10^1}$

D

3 $ \times $ 10⁷

Question 56: Palette 56/60

NEET 2002 MCQ

In hydrogen atom, energy of first excited state is $-$ 3.4 eV. Then find out K.E. of same orbit of hydrogen atom

A

+3.4 eV

B

+6.8 eV

C

$-$ 13.6 eV

D

+13.6 eV

Question 57: Palette 57/60

NEET 2001 MCQ

The following quantum numbers are possible for how many orbitals :

n = 3, $l$ = 2, m = +2 ?

A

1

B

2

C

3

D

4

Question 58: Palette 58/60

NEET 2001 MCQ

Main axis of a diatomic molecule is z, molecular orbital p_x and p_y overlap to from which of the following orbitals.

A

$\pi $ molecular orbital

B

$\sigma $ molecular orbital

C

$\delta $ molecular orbital

D

No bond will form

Question 59: Palette 59/60

NEET 2000 MCQ

Isoelectronic species are

A

CO, CN^$-$, NO⁺, C${_2^{2 - }}$

B

CO^$-$, CN, NO,

C

$C_2^ - $

D

CO, CN, NO, C₂

Question 60: Palette 60/60

NEET 2000 MCQ

For given energy, E = 3.03 $ \times $ 10^$-$19 Joules corresponding wavelength is (h = 6.626 $ \times $ 10^$-$34 J sec, c = 3 $ \times $ 10⁸ m/sec)

A

65.6 nm

B

6.56 nm

C

3.4 nm

D

656 nm