English
Karnataka Board PUCPUC Science Class 11

In which of the following pairs, the ions are iso-electronic? (i) NaX+,MgX2+ (ii) AlX3X+,OX− (iii) NaX+,OX2X− (iv) NX3X−,ClX−

Advertisements
Advertisements

Question

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

Short/Brief Note
Advertisements

Solution

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

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

Explanation:

Isoelectronic species are those species that possess the same number of electrons.

Here both  \[\ce{Na+, Mg^{2+}}\] possess 10 electrons and both \[\ce{Na+ , O2-}\] possess 10 electrons.

shaalaa.com
  Is there an error in this question or solution?
Chapter 2: Structure of Atom - Multiple Choice Questions (Type - I) [Page 18]

APPEARS IN

NCERT Exemplar Chemistry [English] Class 11
Chapter 2 Structure of Atom
Multiple Choice Questions (Type - I) | Q 20 | Page 18

RELATED QUESTIONS

Choose the correct option.

p-orbitals are _________ in shape.


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


Explain in brief, the significance of the azimuthal quantum number.


Write a note on ‘Principal Quantum number.


Indicate the number of unpaired electrons in \[\ce{Si}\] (Z = 14).


The designation of a subshell with n = 6 and l = 2 is ____________.


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.


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?


Orbital angular momentum depends on ______.


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`

Which of the following sets of quantum numbers are correct?

  `n` `l` `m_l`
(i) 1 1 +2
(ii) 2 1 +1
(iii) 3 2 –2
(iv) 3 4 –2

Which of the following statements concerning the quantum numbers are correct?

(i) Angular quantum number determines the three dimensional shape of the orbital.

(ii) The principal quantum number determines the orientation and energy of the orbital.

(iii) Magnetic quantum number determines the size of the orbital.

(iv) Spin quantum number of an electron determines the orientation of the spin of electron relative to the chosen axis.


Which of the following orbitals are degenerate?

3dxy, 4dxy 3dz2, 3dyz, 4dyz, 4dz2  


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.

1s, 2s, 3s, 2p


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


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, solve the questions given below:

Which of the following orbitals has the lowest energy?

4d, 4f, 5s, 5p


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

Choose the INCORRECT statement


Which of the following is the correct plot for the probability density ψ2 (r) as a function of distance 'r' of the electron from the nucleus for 2s orbitals?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×