Home
Class 12
CHEMISTRY
(A) The number of unpaired electrons in ...

(A) The number of unpaired electrons in the following gaseous ion `Mn^(3+),Cr^(3+),V^(3+)` and `Ti^(3+) are 4,3,2` and 1 respectively
(R) `Cr^(3+)` is most stable

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

Text Solution

Verified by Experts

The correct Answer is:
B

Both (A) and (R) are true and (R) is not the correct explanation of (A)
Promotional Banner

Topper's Solved these Questions

  • D-BLOCK ELEMENTS

    AAKASH SERIES|Exercise OBJECTIVE EXERCISE-3 (PREVIOUS NEET/AIPMT QUESTIONS)|43 Videos
  • D - BLOCK ELEMENTS

    AAKASH SERIES|Exercise PRACTICE EXERCISE|50 Videos
  • DILUTE SOLUTIONS

    AAKASH SERIES|Exercise EXERCISE - 1.2|55 Videos

Similar Questions

Explore conceptually related problems

The number of unpaired electrons in Fe^(3+) ion are

Calculate the number of unpaired electrons in the following gaseous ions: Mn^(3+), Cr^(3+), V^(3+) and Ti^(3+) . Which one of these is the most stable in aqueous solution?

The number of unpaired electron in the complex ion [CoF_(6)]^(3-) is

The number of electrons lost during the oxidation of Cr^(3+) " to " Cr_(2)O_(7)^(2-) are

Write down the number of 3d electrons in each of the following ions : Ti^(2+), V^(2+) Cr^(3+) and Mn^(2+) . Indicate how would yoq expect the five 3d orbitals to be occupied for these hydrated ions (octahedral).

The number of electrons involved in the half reaction Cr_(2)O_(7)^(2-)rarr2Cr^(3+) is

The oxidation numbers of Mn in MnO_(4)^(-) and [Mn(CN)_6]^(3-) are respectively.

Write the oxidation numbers of 'Cr' in CrO_(3) Cr_(3)O_(3) and CrO_(3) .

(A) Cr^(+3) and Co^(2+) ions have same number of unpaired electrons but the observed magnetic moment of Cr^(3+) is 3.87 B. M and that of Co^(2+) is 4.87 B.M (R) Due to symmetrica electronic configuration there is no orbital motion of unpaired electron in Cr^(3+) ion while appreciable orbital contribution takes place in Co^(2+) ion .

Give the electronic configuration, the number of unpaired electrons and the type of magnetic behaviour of the following: a) Se^(2-) , b) Mn^(2+) , c) Fe^(3+) and d) Ni

AAKASH SERIES-D-BLOCK ELEMENTS-OBJECTIVE EXERCISE-4 (ASSERTION (A) & REASON (R) TYPE QUESTIONS )
  1. (A) Cr^(+2) is reducing in nature. (R) Half filled t(zg) level in Cr...

    Text Solution

    |

  2. (A) Many copper(I) compounds are unstable in aqueous solution. (R) ...

    Text Solution

    |

  3. (A) The number of unpaired electrons in the following gaseous ion Mn^...

    Text Solution

    |

  4. (A) MnO(4)^(-1) is strong oxidizing agent. (R) Mn^(+2) is stable wit...

    Text Solution

    |

  5. (A) The free gaseous Cr atom has six unpaired electrons. (R) Half fi...

    Text Solution

    |

  6. (A) E^(@) for Mn^(+3)//Mn^(+2) is more positive than Cr^(3+)//Cr^(+2) ...

    Text Solution

    |

  7. (A) K2Cr2O7 is used as primary standard in volumetric analysis. (R) ...

    Text Solution

    |

  8. (A) Solution of Na2CrO4 in water is intensely coloured. (R) Oxidatio...

    Text Solution

    |

  9. (A) Elements of 4f sries are called Lanthanides (R) Lanthanum Belong...

    Text Solution

    |

  10. (A) Silver. Gold and platinum are precious metals. (R) Silver glod a...

    Text Solution

    |

  11. (A) Zn,Cd^(-) and Hg of group 12 are transition metals (R) Partiall...

    Text Solution

    |

  12. (A) Mn & Hg exist in simple crystal structures. (R) Both Mn & Hg are...

    Text Solution

    |

  13. (A) Metals of 4d and 5d series have greater enthalpies of atomization ...

    Text Solution

    |

  14. (A) The enthalpy of atomization of zinc is the highest in 3d series. ...

    Text Solution

    |

  15. (A) Second ionization enthalpies of Cr and Cn are very low (R) Both ...

    Text Solution

    |

  16. (A) The calculated spin only magnetic moment of Ti^(+2) is 1.73 BM. ...

    Text Solution

    |

  17. (A) Ni^(+2) salts are pink in colour (R) Ni^(+2) absorb light in IR ...

    Text Solution

    |

  18. (A) Cu^(+) is highly stable in aqueous solution (R) E.C of Cu^(+) is...

    Text Solution

    |

  19. (A) Chromates and dichromates are not interconvertible in aqueous solu...

    Text Solution

    |

  20. (A) Cu has a unique behavior having a positive SRP. (R) Cu is unabl...

    Text Solution

    |