P Block Elements
Get insights from 254 questions on P Block Elements, answered by students, alumni, and experts. You may also ask and answer any question you like about P Block Elements
- 254
Questions
- 0
Discussions
- 0
Active Users
- 0
Followers
Have a question about P Block Elements? Ask our experts
Keep it short & simple. Type complete word. Avoid abusive language.
7.54
Freons or chlorofluorocarbons [CFCs] are aerosols that accelerate the depletion of ozone. In presence of ultraviolet radiation [UV radiation], these chlorofluorocarbons break down to give chlorine ions which combine with the ozone atoms in the atmosphere to give oxygen atoms.
Upvote 
7.53 Knowing the electron gain enthalpy values for O → O- and O → O2- as –141 and 702 kJ mol–1 respectively, how can you account for the formation of a large number of oxides having O2- species and not O- ? (Hint: Consider lattice energy factor in the formation of compounds).
7.53 Knowing the electron gain enthalpy values for O → O- and O → O2- as –141 and 702 kJ mol–1 respectively, how can you account for the formation of a large number of oxides having O2- species and not O- ? (Hint: Consider lattice energy factor in the formation of compounds).
7.53
Stability of an ionic compound depends on its lattice energy. More the lattice energy of a compound, more stable it will be. Lattice energy is directly proportional to the charge carried by an ion.
When a metal combines with oxygen, the lattice energy of the oxide involving O2- ion is much more t
Upvote 7.52
Oxygen is smaller in size as compared to sulphur. Due to its smaller size, it can effectively form p – p bonds and form O2 [O = O] molecule. Also, the intermolecular forces in oxygen are weak van there Wall’s, which cause it to exist as a gas.
On the other hand, sulphur does not form M2 molecule
Upvote 7.51 Justify the placement of O, S, Se, Te and Po in the same group of the periodic table in terms of electronic configuration, oxidation state and hydride formation.
7.51 Justify the placement of O, S, Se, Te and Po in the same group of the periodic table in terms of electronic configuration, oxidation state and hydride formation.
7.51
The elements of group 16 are collectively called chalcogens.
[i]. Elements of group 16 have six valence electrons each. The general electronic configuration of these elements is ns2 np4, where n varies from 2 to 6.
[ii]. Oxidation state: As these elements have six valence electrons [ns2np4
Upvote 7.50 Can PCl5 act as an oxidising as well as a reducing agent? Justify.
7.50 Can PCl5 act as an oxidising as well as a reducing agent? Justify.
7.50
Phosphorous Pentachloride [PCl5] cannot act as reducing agent because in the PCl5, the oxidation state of chlorine is +5 and it is not possible for Chlorine to increase its oxidation state beyond +5 but it can very easily act as an oxidizing agent because it can easily reduce its oxidation state
Upvote 7.49 Give the disproportionation reaction of H3PO3.
7.49 Give the disproportionation reaction of H3PO3.
7.49
Disproportionation is a chemical reaction typically a redox reaction where a molecule is transformed into two or more dissimilar products.
On heating, orthophosphorus acid (H3PO3) disproportionate to give orthophosphoric acid (H3PO4)
and phosphine (PH3). The oxidation states of Phosphorous i
Upvote 7.48 Why does nitrogen show catenation properties less than phosphorus?
7.48 Why does nitrogen show catenation properties less than phosphorus?
7.48
Catenation is the bonding of atoms of the same element into a series to form a chain. Catenation is much more common in phosphorous compounds than in nitrogen compounds.
This is because of the relative weakness of the NN single bond as compared to the PP single bond. Since nitrogen atom is smalle
Upvote 7.47 Write main differences between the properties of white phosphorus and red phosphorus.
7.47 Write main differences between the properties of white phosphorus and red phosphorus.
7.13
Red Phosphorus |
White Phosphorus |
1. It is soft solid and almost colourless but acquires pale yellow colour on standing. | 1. It is a red solid. |
2. It melts at 317 K and boils at 563 K. | 2. It burns at 533K to give phosphorous pentaoxide. |
3. With air contact it undergoes slow combustion and glows in dark. This property is called chemiluminescence. | 3. It does not glow in dark. |
4. It is insoluble in water but readily soluble in carbon disulphide and oils. | 4. It is insoluble in water as well as in carbon disulphide. |
5. It is very reactive and catches fire when heated in air. On burning it gives dense white fumes of phosphorus pentoxide. | 5. It is more stable and chemically less reactive as compared to white phosphorus. |
Upvote 7.46 Nitrogen exists as diatomic molecule and phosphorus as P4. Why?
7.46 Nitrogen exists as diatomic molecule and phosphorus as P4. Why?
7.46
Nitrogen owing to its small size has a tendency to form p – p multiple bonds with itself. Nitrogen thus forms a very stable diatomic molecule, N2.
On moving down, a group, the tendency to form p–p bonds decreases [because of the large size of heavier elements]. With the increase in the size of at
Upvote 7.45 Explain why NH3 is basic while BiH3 is only feebly basic.
7.45 Explain why NH3 is basic while BiH3 is only feebly basic.
7.45
Nitrogen has a smaller size than Bismuth, because on going down the group the atomic size increases
i.e. N
Due to smaller size, there is very high electron density around Nitrogen as compared to Bismuth. Therefore, nitrogen atom can easily release electrons. And, we know higher the electron donat
Upvote