Home
Class 12
CHEMISTRY
(i) Which allotrope of phosphorus is mor...

(i) Which allotrope of phosphorus is more reactive and why ?
(ii) How are the supersonic jet aeroplanes responsible for the depletion of ozone layers ?
(iii) `F_(2)` has lower bond dissociation enthalpy than `Cl_(2)`. Why ?
(iv) While noble gas is used in filling balloons for meterological observations ?

Text Solution

Verified by Experts

(i) White phosphorus is more reactive because of its pyramidal structure and the strain involved in the `P_(4)` molecule.
(ii) Oxides of nitrogen emitted by supersonic jet planes are responsible for the depletion of ozone layer.
(iii) N/A
(iv) Helium is used in filling balloons for meterological observations.
Promotional Banner

Topper's Solved these Questions

  • THE P-BLOCK ELEMENTS

    DINESH PUBLICATION|Exercise Higher Order Thinking Skills|11 Videos

  • THE P-BLOCK ELEMENTS

    DINESH PUBLICATION|Exercise Problems For Practice|54 Videos

  • THE P-BLOCK ELEMENTS

    DINESH PUBLICATION|Exercise Long Answer Type Questions|3 Videos

  • THE OXYGEN FAMILY

    DINESH PUBLICATION|Exercise PREPARATORY PACKAGE|14 Videos

Similar Questions

Explore conceptually related problems

Assertion (A): F, has lower bond dissociation energy than Cl_(2) . Reason (R): Flourine is more electronegative than chlorine.

Give reasons : (i) PCl_(5) is more volatile than PCl_(3) . (ii) O-O bond has lower bond dissociation enthalpy than S-S bond. (iii) F_(2) is stronger oxidising than Cl_(2) .

(a) H_(2)^(+)and H_(2)^(-) ions have same bond order but H_(2)^(-) ion is more stable. Explain. (b) N_(2) has a greater bond dissociation enthalpy than N_(2)^(+) ion hals more bond dissociation enthalpy than O_(2). Why ? (c ) Can we have ahomonuclear diatomic molecule with all its ground state molecular orbitals full of electrons ? (d) When a magnet is dipped in a jar of liquid oxygen, some oxygen clings to it. Assign reason :

State the bond order and indicate whether the species is paramagnetic (i) B_(2) (ii) C_(2) (iii) N_(2) (iv) O_(2) (v) Br_(2) (vi) CI_(2)^(o+) Which of the following molecules has the highest bond order (i) Ne_(2) (ii) F_(2) (c) Explain why N_(2) has a greater dissociation energy than N_(2)^(o+) , whereas O_(2) has a lower dissociation energy tnan O_(2)^(o+) (b) The bonding sigma 2s orbital has a higher energy than the antibonding sigma^(**) 1s orbitals Why is the former a bonding orbital while the latter is an antibonding .

Which of the following statements are True (T) or False (F)? Mark them and select the answer from the codes given below. (I) Ozone is not responsible for greenhouse effect. (II) Ozone can oxidize SO_(2) present in the atmosphere to SO_(3) (III) Ozone hole is thinning of ozone layer present in stratosphere. (IV) Ozone is produced in the upper stratosphere by the action of UV rays on oxygen.

Account of the following observations (a) Ammonium salts are more soluble in water than the corresponding sodium salts (b) BeCI_(2) is linear but SnCI_(2) is angular (c ) F_(2) gas is more reactive than CI_(2) gas (d) The bond lengths of both O-O bonds in ozone are equal .

What is the number of molecular orbitals obtained by mixing of two atomic orbitals ? (b) Out of F_(2) and OF which of these molecules is (are) paramagnetic (ii) Which should be more stable towards dissociation into atoms OF or F_(2) (c ) Explain why NO^(o+) is more stable towards dissociation into atoms than NO whereas CO^(o+) is less stable than CO (d) Predict whether He_(2)^(o+) ion in its electronic ground state is stable towards dissociation into he and He^(o+) .

Molecular orbitals are formed by the overlap of atomic orbitals. The combining orbitals must have proper orientation so that they can overlap to a considerable extent. Two atomic orbitals combine to form two molecular orbitals called bonding molecular orbital and antibonding molecular orbital. Bonding molecular orbital is stable and antibonding molecular orbital is unstable. sigma MO is formed by head on overlap while pi MO is formed by sidewise overlap. The MOs are filled with electrons according to the same rules as followed for filling atomic orbitats. Bond order is one of the most important parameter to compare the bond strength and bond length of bonds. Why has N_2 a larger dissociation energy than N_2 ^(+) whereas O_2 has a lower dissociation energy than O_(2)^(+) ?

DINESH PUBLICATION-THE P-BLOCK ELEMENTS -Questions From Board Examinations
  1. Why is the BiH(3) strongest reducing agent amongst all the hydrides of...

    Text Solution

    |

  2. Which poisonous gas is evolved when white phosphorus is heated with co...

    Text Solution

    |

  3. (i) Which allotrope of phosphorus is more reactive and why ? (ii) Ho...

    Text Solution

    |

  4. Give reason for the following : (i) Chlorine water loses its colour ...

    Text Solution

    |

  5. Draw the structures of (i) H(2)S(2)O(8) (ii) XeO(4).

    Text Solution

    |

  6. On heating copper turnings with conc. HNO(3), a brown coloured gas is ...

    Text Solution

    |

  7. Give reasons : (i) PCl(5) is more volatile than PCl(3). (ii) O-O b...

    Text Solution

    |

  8. Assign reason for the following : (i) H(3)PO(2) is a stronger reduci...

    Text Solution

    |

  9. ON adding NaOH to ammonium sulphate, a colourless gas with pungent odo...

    Text Solution

    |

  10. Considering the parameters such as bond dissociation enthalpy, electro...

    Text Solution

    |

  11. Write the conditions to maximize the yield of H(2)SO(4) by contact pro...

    Text Solution

    |

  12. Arrange the following in increasing order of the property indicated : ...

    Text Solution

    |

  13. (a) Write the laboratory method for the preparation of HNO(3). (b) W...

    Text Solution

    |

  14. Describe the manufacture of sulphuric acid by contact process on the b...

    Text Solution

    |

  15. (i) Why is concentrated H(2)SO(4) always diluted by adding H(2)SO(4) t...

    Text Solution

    |

  16. What happens when (i) Orthophorus acid is heated ? (ii) XeF(6) und...

    Text Solution

    |

  17. Write the disproportionation reaction of that oxoacid of nitrogen in w...

    Text Solution

    |

  18. Electron gain enthalpies of halogens are largely negative. Explain.

    Text Solution

    |

  19. Why is N(2)O(5) more acidic than N(2)O(3) ?

    Text Solution

    |

  20. H(3)PO(2) acts as a monobasic acid. Explain.

    Text Solution

    |