Home
Class 12
CHEMISTRY
Assertion : An important feature of fluo...

Assertion : An important feature of fluorite structure is that cations being large ib size occupy `FC C` lattice points, the formula unit `AB_(2)` (A cation, B anion)
Reason: There are `6` cations and `12` anions per `FC C` unit cell of the flucrite structure

A

Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1

B

Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1

C

Statement-1 is True, Statement-2 is False.

D

Statement-1 is False, Statement-2 is True.

Text Solution

Verified by Experts

The correct Answer is:
C
Based on Fluorite structure of `CaF_2`
Promotional Banner

Topper's Solved these Questions

  • QUALITATIVE ANALYSIS PART 1

    RESONANCE|Exercise A.L.P|39 Videos

  • SOLID STATE

    RESONANCE|Exercise PHYSICAL CHEMITRY (SOLID STATE)|45 Videos

Similar Questions

Explore conceptually related problems

Assertion:- Antigluorite structure is 4:8 (cation:anion) type coordination crystal. Reason:- Ratio of no. of cation and anions in CaF_(2) crystal is 1:2

An ionic compound is made up of cations A and anions B . if cations A are at the alternate corners and anions are at the alternate faces of the cubic unit cell then empirical formula of the compound will be

Early crystallographers had trouble solving the structures of inorganic solids using X-ray diffraction because some of the mathematical tools for analyzing the data had not yet been developed. Once a trial structure was proposed, it was relatively easy to calculate the diffraction pattern, but it was difficult to go the other way (from the diffraction pattern to the structure) if nothing was known a priori about the arrangement of atoms in the unit cell. It was important to develop some guidelines for guessing the coordination numbers and bonding geometries of atoms in crystals. The first such rules were proposed by Linus Pauling, who considered how one might pack together oppositely charged spheres of different radii. Pauling proposed from geometric considerations that the quality of the "fit" depended on the radius ratio of the anion and the cation. If the anion is considered as the packing atom in the crystal, then the smaller cation fills interstitial sites ("holes"). Cations will find arrangements in which they can contact the largest number of anions. If the cation can touch all of its nearest neighbour anions then the fit is good. If the cation is too small for a given site, that coordination number will be unstable and it will prefer a lower coordination structure. The table below gives the ranges of cation/anion radius ratios that give the best fit for a given coordination geometry. A solid AB has square planar structure. If the radius of cation A^+ is 120pm,Calculate the maximum possible value of anion B^-

RESONANCE-RANK BOOSTER-All Questions
  1. The co-ordination number of FCC structure for metals is 12, since:

    Text Solution

    |

  2. An hcp and a ccp structure for a given element would be expected to ha...

    Text Solution

    |

  3. Assertion : An important feature of fluorite structure is that cations...

    Text Solution

    |

  4. Assertion :In NaCIcrystal each Na^(+) ion is tourching 6 CI^(-) ion bu...

    Text Solution

    |

  5. When an atom or an ion is missing from its nomal lattice site a lattic...

    Text Solution

    |

  6. Column-I and Column-II contains four entries each.Entries of Column-I ...

    Text Solution

    |

  7. A(2)B molecules(" molar mass " = 259.8 g//"ml") crystallises in a hex...

    Text Solution

    |

  8. In F.C.C. arrangement of identical spheres, distance between two neare...

    Text Solution

    |

  9. N2 and H2 are taken in 1:3 molar ratio in a closed vessel to attained ...

    Text Solution

    |

  10. The unit of equilibrium constant KC of a reaction is "mol"^(-2) boat^2...

    Text Solution

    |

  11. NH4COONH2 (s) hArr 2NH3(g)+CO(2)(g) If equilibrium pressure is 6 atm...

    Text Solution

    |

  12. A 10 litre box contains O3 and O2 at equilibrium at 2000 K. Kp=4xx10^(...

    Text Solution

    |

  13. The following two reactions: i. PCl(5)(g) hArr PCl(3)(g)+Cl(2)(g) ...

    Text Solution

    |

  14. For the chemical reaction 3X(g)+Y(g) hArr X(3)Y(g), the amount of ...

    Text Solution

    |

  15. What is the minimum mass of CaCO3(s), below which it decomposes comple...

    Text Solution

    |

  16. For an equilibrium H2O(s) hArr H2O(l)which of the following statements...

    Text Solution

    |

  17. If two gases AB(2) and B(2)C are mixed, following equilibria are readi...

    Text Solution

    |

  18. The following reaction attains equlibrium at high temperature N(2)(g...

    Text Solution

    |

  19. Assertion : Ag(2) S + 4 KCN 2K [Ag(CN)(2)] + K(2) s Reason : The rea...

    Text Solution

    |

  20. Le Chatelier's Principle If a system at equilibrium is subjected to ...

    Text Solution

    |