Home
Class 12
CHEMISTRY
(A) Amorphous Substances are isotropic (...

(A) Amorphous Substances are isotropic (R) Properties like refractive index, electrical conductance have different value in diffe-rent direction for isotropic substances.

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:
C
Promotional Banner

Topper's Solved these Questions

  • SOLID STATE

    AAKASH SERIES|Exercise LEVEL - I (EXERCISE - I)|68 Videos

  • SOLID STATE

    AAKASH SERIES|Exercise LEVEL - I (EXERCISE - II)|77 Videos

  • SOLID STATE

    AAKASH SERIES|Exercise OBJECTIVE EXERCISE -3|22 Videos

  • REVISION EXERCISE

    AAKASH SERIES|Exercise COMPLEX COMPOUNDS|47 Videos

  • SOLIDS STATE

    AAKASH SERIES|Exercise PRACTICE EXERCISE|63 Videos

Similar Questions

Explore conceptually related problems

(A) Every substance is super conducting at room temperature. (R) A super conducting substance offers resistance to the flow of electricity

(A): When two conducting wires of different resistivity having same cross section are joined in series, the electric field in them would be equal when they carry equal current (R): When wires are in series they carry unequal current

The sinle quantum number by Neil.s Bohr and the appearance of several spectral lines in a particular series of Hspectrum, suggest that there more than one quantum to explain all the quantized properties of an electron in a particular energy level inside the atom. If fact when the properties of the electron is transformed from Cartesian co-ordinate to polar co-ordinates then it becomes the function of r, theta and phi suggesting three independet quantum numbers. In addition to this a fourth quantum number is required to consider the spinning behaviour of an electron. The principal quantum number n suggest the orbit number in which electron revolves, Azimuthal quantum number 1 suggest the shape of orbitals, magnetic quantum number m, gives orientation of orbital in presence of external magnetic field, while spin quantum number s, gives direction of an electron about its own axis n != 0 values of "1" ranges in between 0 to (n-1), while m depends upon 1. Total number values of m = 21+1, and "m" ranges in between -1 to +1 including 0. For each electron spin will be +-(1)/(2) The two unpaired electron present in C-atom are different w.r.t their

Covalent molecules formed by heteroatoms bound to have some ionic character. The ionic character is due to shifting of the electron pair towards A or B in the molecule AB. Hence, atoms acquire small and equal charge but opposite in sign. Such a bond which has some ionic character is described as polar covalent bond. Polar covalent molecules can exhibit dipole moment. Dipole moment is equal to the product of charge separation, q and the bond length, d for the bond. The unit of dipole moment is Debye. One Debye is equal to 10^(-18) esu cm. Dipole moment is a vector quantity. It has both magnitude and direction. Hence, dipole moment of molecules depends upon the relative orientation of the bond dipoles, but not on the polarity of bonds alone. A symmetrical structure shows zero dipole moment. Thus, dipole moments help to predict the geometry of the molecules. Dipole moment values can be used to distinguish between cis-and traps-isomers, ortho-, meta-and para-forms of a substance, etc. The percentage of ionic character of a bond can be calculated by the application of the following formula : % " ionic character " = ("Experimental value of dipole moment ")/("Theoretical value of dipole moment ") xx 100 Which are non-polar molecules?

Covalent molecules formed by heteroatoms bound to have some ionic character. The ionic character is due to shifting of the electron pair towards A or B in the molecule AB. Hence, atoms acquire small and equal charge but opposite in sign. Such a bond which has some ionic character is described as polar covalent bond. Polar covalent molecules can exhibit dipole moment. Dipole moment is equal to the product of charge separation, q and the bond length, d for the bond. The unit of dipole moment is Debye. One Debye is equal to 10^(-18) esu cm. Dipole moment is a vector quantity. It has both magnitude and direction. Hence, dipole moment of molecules depends upon the relative orientation of the bond dipoles, but not on the polarity of bonds alone. A symmetrical structure shows zero dipole moment. Thus, dipole moments help to predict the geometry of the molecules. Dipole moment values can be used to distinguish between cis-and traps-isomers, ortho-, meta-and para-forms of a substance, etc. The percentage of ionic character of a bond can be calculated by the application of the following formula : % " ionic character " = ("Experimental value of dipole moment ")/("Theoretical value of dipole moment ") xx 100 A diatomic molecule has a dipole moment of 1.2 D. If the bond length is 1.0 xx 10^(-8) cm, what fraction of charge does exist on each atom?

Covalent molecules formed by heteroatoms bound to have some ionic character. The ionic character is due to shifting of the electron pair towards A or B in the molecule AB. Hence, atoms acquire small and equal charge but opposite in sign. Such a bond which has some ionic character is described as polar covalent bond. Polar covalent molecules can exhibit dipole moment. Dipole moment is equal to the product of charge separation, q and the bond length, d for the bond. The unit of dipole moment is Debye. One Debye is equal to 10^(-18) esu cm. Dipole moment is a vector quantity. It has both magnitude and direction. Hence, dipole moment of molecules depends upon the relative orientation of the bond dipoles, but not on the polarity of bonds alone. A symmetrical structure shows zero dipole moment. Thus, dipole moments help to predict the geometry of the molecules. Dipole moment values can be used to distinguish between cis-and traps-isomers, ortho-, meta-and para-forms of a substance, etc. The percentage of ionic character of a bond can be calculated by the application of the following formula : % " ionic character " = ("Experimental value of dipole moment ")/("Theoretical value of dipole moment ") xx 100 Arrange the following compounds in increasing order of dipole moments, toluene (I), o- dichlorobenzene (II), m-dicblorobenzene (III) and p dichlorobenzene (IV) :

Covalent molecules formed by heteroatoms bound to have some ionic character. The ionic character is due to shifting of the electron pair towards A or B in the molecule AB. Hence, atoms acquire small and equal charge but opposite in sign. Such a bond which has some ionic character is described as polar covalent bond. Polar covalent molecules can exhibit dipole moment. Dipole moment is equal to the product of charge separation, q and the bond length, d for the bond. The unit of dipole moment is Debye. One Debye is equal to 10^(-18) esu cm. Dipole moment is a vector quantity. It has both magnitude and direction. Hence, dipole moment of molecules depends upon the relative orientation of the bond dipoles, but not on the polarity of bonds alone. A symmetrical structure shows zero dipole moment. Thus, dipole moments help to predict the geometry of the molecules. Dipole moment values can be used to distinguish between cis-and traps-isomers, ortho-, meta-and para-forms of a substance, etc. The percentage of ionic character of a bond can be calculated by the application of the following formula : % " ionic character " = ("Experimental value of dipole moment ")/("Theoretical value of dipole moment ") xx 100 The dipole moment of NF_(3) is very much less than that of NH_(3) because :

AAKASH SERIES-SOLID STATE-OBJECTIVE EXERCISE -4
  1. (A) Ionic solids are characterized by high melting and boiling point. ...

    Text Solution

    |

  2. (A) Molecular solids are characterized by low melting point. (R) Molec...

    Text Solution

    |

  3. (A) Amorphous Substances are isotropic (R) Properties like refractive ...

    Text Solution

    |

  4. (A) Conductivity of silicon increases by doping it with group-15 eleme...

    Text Solution

    |

  5. (A) Cadmium sulphide is perfectly covalent (R) The difference of elect...

    Text Solution

    |

  6. (A) Crystalline solids are anisotropic in nature (R) Crystalline subs...

    Text Solution

    |

  7. (A) Packing efficiency of hep and CCP are not equal (R) hep, ccp both ...

    Text Solution

    |

  8. (A) Visible light can not be used to study crystals (R) The wave lengt...

    Text Solution

    |

  9. (A) All covalent solids are non conductors (R) Graphite is a ionic so...

    Text Solution

    |

  10. (A) I(2), CO(2) have low melting point (R) I(2), CO(2) have weak disp...

    Text Solution

    |

  11. (A) Metallic solids are electrical and thermal conductors (R) Metallic...

    Text Solution

    |

  12. (A) Orthorhombic crystal system has four Bravis lattices (R) Orthorhom...

    Text Solution

    |

  13. (A) F- centre brings about colour (R) Vacancy with a trapped cation is...

    Text Solution

    |

  14. (A) Zinc oxide is yellow coloured when hot (R) Zinc oxide has metal e...

    Text Solution

    |

  15. (A) : Crystalline solids have sharp and chara cteric melting points. ...

    Text Solution

    |

  16. (A) Diamond and graphite are polymorphic forms (R) Carbon adopts diffe...

    Text Solution

    |

  17. (A) : During vacancy defect the density of solid decreases (R): The ...

    Text Solution

    |

  18. (A) : In many crystal structures of ionic substances cations occupy th...

    Text Solution

    |

  19. (A) Single crystals are formed when the process of crystallization is ...

    Text Solution

    |

  20. (A): Crystalline solids are anisotropic (R): Crystalline solids are ...

    Text Solution

    |