English
Karnataka Board PUCPUC Science Class 11

The probability density plots of 1s and 2s orbitals are given in Figure: The density of dots in a region represents the probability density of finding electrons in the region.

Advertisements
Advertisements

Question

The probability density plots of 1s and 2s orbitals are given in Figure:


The density of dots in a region represents the probability density of finding electrons in the region.

On the basis of above diagram which of the following statements is incorrect?

Options

  • 1s and 2s orbitals are spherical in shape.

  • The probability of finding the electron is maximum near the nucleus.

  • The probability of finding the electron at a given distance is equal in all directions.

  • The probability density of electrons for 2s orbital decreases uniformly as distance from the nucleus increases.

MCQ
Advertisements

Solution

The probability density of electrons for 2s orbital decreases uniformly as distance from the nucleus increases.

Explanation:

As per the probability density curve, the probability of finding the electrons at the 1s orbital decreases as we move far from the nucleus, however in case of 2s the probability decreases initially then it increases with the distance and thereafter at a certain point it starts decreasing with the distance.

shaalaa.com
  Is there an error in this question or solution?
Chapter 2: Structure of Atom - Multiple Choice Questions (Type - I) [Page 14]

APPEARS IN

NCERT Exemplar Chemistry Exemplar [English] Class 11
Chapter 2 Structure of Atom
Multiple Choice Questions (Type - I) | Q 3 | Page 14

RELATED QUESTIONS

State Hund’s rule of maximum multiplicity with a suitable example.


Write orbital notations for the electron in orbitals with the following quantum numbers.

n = 2, l = 1


Write orbital notations for the electron in orbitals with the following quantum numbers.

n = 3, l = 2


Write electronic configurations of \[\ce{Fe, Fe2+, Fe3+}\].


Write condensed orbital notation of electronic configuration of the following element:

Carbon (Z = 6)


Draw shapes of 2p orbitals.


Using the concept of quantum numbers, calculate the maximum numbers of electrons present in the ‘M’ shell. Give their distribution in shells, subshells, and orbitals.


Indicate the number of unpaired electron in:

Cr (Z = 24)


The principal quantum number (n) and magnetic quantum number (ml) for the valence electrons of rubidium atom (Z = 37) are ____________ respectively.


How many electrons in 19K have n = 3, l = 1?


The three electrons have the following set of quantum numbers:

X = 6, 1, −1, `+1/2`

Y = 6, 0, 0, `+1/2`

Z = 5, 1, 0, `+1/2`

Identify the CORRECT statement.


Which of the following has a greater number of electrons than neutrons?

(Mass number of Mg, C, O and Na is 24, 12, 16 and 23 respectively).


The number of radial nodes for 3p orbital is ______.


Out of the following pairs of electrons, identify the pairs of electrons present in degenerate orbitals:

(i)  (a) `n = 3, l = 2, m_l = -2, m_s = - 1/2`
  (b) `n = 3, l = 2, m_l = -1, m_s = - 1/2`
   
(ii)  (a) `n = 3, l = 1, m_l = 1, m_s = + 1/2`
  (b) `n = 3, l = 2, m_l = 1, m_s = + 1/2`
   
(iii) (a) `n = 4, l = 1, m_l = 1, m_s = + 1/2`
  (b) `n = 3, l = 2, m_l = 1, m_s = + 1/2`
   
(iv)  (a) `n = 3, l = 2, m_l = +2, m_s = - 1/2`
  (b) `n = 3, l = 2, m_l = +2, m_s = + 1/2`

In which of the following pairs, the ions are iso-electronic?

(i) \[\ce{Na^{+}, Mg^{2+}}\]

(ii) \[\ce{Al3^{+}, O-}\]

(iii) \[\ce{Na+ , O2-}\]

(iv) \[\ce{N3-, Cl-}\]


The arrangement of orbitals on the basis of energy is based upon their (n + l) value. Lower the value of (n + l), lower is the energy. For orbitals having same values of (n + l), the orbital with lower value of n will have lower energy.

Based upon the above information, arrange the following orbitals in the increasing order of energy.

4s, 3s, 3p, 4d


Match the following

(i) Photon (a) Value is 4 for N shell
(ii) Electron (b) Probability density
(iii) ψ2 (c) Always positive value
(iv) Principal quantum number n (d) Exhibits both momentum and wavelength

Match species given in Column I with the electronic configuration given in Column II.

Column I Column II
(i) \[\ce{Cr}\] (a) [Ar]3d84s0
(ii) \[\ce{Fe^{2+}}\] (b) [Ar]3d104s1
(iii) \[\ce{Ni^{2+}}\] (c) [Ar]3d64s0
(iv) \[\ce{Cu}\] (d) [Ar] 3d54s1
  (e) [Ar]3d64s2

Which of the following element do not follow Aufbau principle?


What are the possible values of magnetic quantum number for p orbital?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×