P-Block Notes

why does mating and boiling point increrases down the group? Atomic sige increasce so van den waars force increases with increase in atomic nuтьен Oxygen umexpectedly has low serigation cuection gain enthalpy? small sige of 02 90 small electron dond b) Inter luctuonic repulsion on the incoming cuction. Sunkum has a greame Hamrency for contronation enam kaygon 3. Oxygen gas winter seus per exist as solia wny a) small size, it towns pit-pit bonds and foum diatomic 02 molicere. b) Intermolecular forces are wrak vom der waar fouces шешеси салes it to exist as dlatonic a) Sulphur does not foum doubce bords and exist as рисkеrеd suucture held by covalent bonds and exists as polyaromec. A. Large difference meeting and volling point of Oz and $81. dove to them atomocity On exist as diatomic mareсии. thesurare is exist as polyatomic malicile. 5. om going down the group oraviury of -2 0.8 decreases ? Down the group stavruty of -2 0-3 decreases due to decrease i'm electronegativity 6. Bond angle in nydrides decreases on going doven the guoup? of Size of central metall arom increases and electronegativity recreases on going down the group so touce between bonded pair of cictiones decreases. Decreasing order of sand angle H₂O HS Hose > Ha Te 7. Acidic character increases down the group wny? a) Size of central metal atom inculasks and aestance wim hydrogen atom increase on going davon the group. b) Bond ungen increases and bond dissociation ethalpy accucass. Decreasing onder of acidic character. Hy Te? Hoser H₂S H₂O 8. Thermal stability on going down the group deceans? a) size of centual metal atom increases. form stable covalent bond with H₂ decreases. Decreasing thermal stability H2O HS H2Ser Ho Te tendency to 9. Reducing character of hydrides increases down the group. whys a Thermal orability decreases down the group. Ormeater to unstabilly grater its Decreasing reducing 28. Fluomune exhibits only -1 0.8 venereas other halogens exhibit positive 0-3 .why? Huovine is most electronegative surment cond cannot exhibit any positive ons on the other hand amer malogins and less electronegative and therefore can erenibit positive 0.8 smey also have vacant d-subitoru and hence can expand their octets. 29. He when weacts with finely divided non foume fermous criouide and not forure chronide? Hel when weacts with finely divided mon produce 12 gas. 22. In the preparation of H2504 by contact process, why is sos. mat absorbed directly in water to form H₂SOy? I'm Contact process S03 is not absorbed directly In water to form H2SO4 because the reaction. is highly exothermic + acid mist us formed Dence, the reaction becomes difficult to mander 38. Explain meny CIF3 exists best Fls does mat exist? Existance of Ifg and Fag can we explained. on the basis of size of central atom. Because ferovime is more electronegative as compared to unsorine and has smaller size. Thus, one large ca atom can accomodate three smaller Farom but veeverse is not 84. 3FG is known but scl6 is not wny? Fluorine atom is smaller in size so. six F ions can surround a sulphur atom. The case is not so with chlorine atom due to ite large size. So, SF6 is known but 816 not known due to interionic repulsion eetween rarger et ions. 86. Explain weny ozone is thermodynamically less stalele than oxygen? Ozone is thermodynamically less staver than 02 because its decomposition into Oz results in the leeration of heat and an increase un intropy these two effects reinforce each other, resulting in larger negative Gribbe energy change for its conversion into 02 • 302 dilute solution act as an desinfectant • 802. acts as releaching agent in moist conditione. • Peroxoacid have -0-0- vond. (H2805 and H25208) . afy - Bee-saw shape. 36. 602 cam act as both oxidising and reducing agerit wut His only acts as weducing agents winy? Im 802 0.3 of ruphur is to which lies between (-2) and (+6) so it can increase or decrease entle im H₂S O.S of sulphur is (72) which is minimum and it can only imovare in H2S.