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Question bank:

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

10

6

4

2

Based on equation

$E = - 2.178 \times 10^{- 18} J (\frac{Z^{2}}{n^{2}})$ certain conclusions are written. Which of them is not correct?

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

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

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

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

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

14

16

10

12

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

16
32
4
8

The energies E₁ and E₂ of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths i.e., λ₁ and λ₂ will be

λ₁ = 2λ₂
λ₁ = 4λ₂
λ₁ =

\frac{1}{2}

λ₂
λ₁ =

Which one of the following ions has electronic configuration [Ar]3d⁶?

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

Ni³⁺
Mn³⁺
Fe³⁺
Co³⁺

Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states ?

3d³, 4s²
3d⁵, 4s¹
3d⁵, 4s²
3d², 4s²

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

4l+2
2l+ 1
4l - 2
2n²

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

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

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

\frac{1}{2 m} \sqrt{\frac{h}{π}}

\sqrt{\frac{h}{2 π}}

\frac{1}{m} \sqrt{\frac{h}{π}}

\frac{h}{π}

The measurement of the electron position is associated with an uncertainty in momentum, which is equal to 1x10^-18 g cm s^-1. The uncertainty in electron velocity is,

(mass of an electron is 9 x 10^-28 g)

1 x 10⁹ cm s^-1
1 x 10⁶ cm s^-1
1 x 10⁵ cm s^-1
1 x 10¹¹ cm s^-1

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 numbers is not possible?

ii, iii and iv
i, ii, iii and iv
ii, iv and v
i and iii

Given: The mass of electron is 9.11 x 10^-31 kg

Planck constant is 6.626 x 10^-34 Js,

the uncertainty involved in the measurement of velocity within a distance of 0.1 $\overset{°}{A}$ is:

5.79 x 10⁶ ms^-1
5.79 x 10⁷ ms^-1
5.79 x 10⁸ ms^-1
5.79 x 10⁵ ms^-1

The orientation of an atomic orbital is governed by:

azimuthal quantum number
spin quantum number
magnetic quantum number
principal quantum number

Iodine molecule dissociates into atoms after absorbing light of 4500 $\overset{\circ}{A}$ . If one quantum of radiation is absorbed by each molecule, calculate the kinetic energy of iodine atoms. Bond energy of I₂ is 240 kJ mol^-1.

2.16 \times 10^{- 20} J

0.16 \times 10^{- 20} J

5.03 \times 10^{- 20} J

8.32 \times 10^{- 20} J

NEET Questions

Question bank:

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

Based on equation E = -2.178 × 10-18 J Z2n2 certain conclusions are written. Which of them is not correct?