Worksheet on p Block
3
WORKSHEET BY NANCY GEORGE (BSSS) Important Questions of p-BLOCK Account for the following: 1. Nitrogen does not form pentahalides. 2. Pentahalides are more covalent than trihalides. 3. BiH 3 is strongest reducing agent among the hydrides of group 15 elements. 4. NH 3 has higher boiling point than PH 3 . 5. Phosphorus undergoes greater extent of catenation than Nitrogen. 6. The N-N single bond is weaker than the P-P bond. 7. Nitrogen is inert at room temperature. 8. R 3 P=O exists but R 3 N=O does not exist. 9. White phosphorus is less stable and more reactive than red phosphorus. 10. Bond angle in PH 4 + is higher than in PH 3 . 11. PCl 3 & PCl 5 fumes in moist air. 12. The five bonds in PCl 5 are not equivalent. 13. In solid state, PCl 5 exists as an ionic solid. 14. H 3 PO 4 is tribasic, H 3 PO 3 is dibasic and H 3 PO 2 is monobasic. 15. H 3 PO 2 (Hypophosphorus acid) is a reducing acid. 16. PH 3 is basic in nature. 17. R 3 P=O exists but not R 3 N=O. 18. Oxygen has less electron gain enthalpy than sulphur. 19. Acidic character increases from H 2 O to H 2 Te. 20. H 2 S is less acidic than H 2 Te. 21. Thermal stability of hydrides also decreases from H 2 O to H 2 Po. 22. Reducing character increases from H 2 S to H 2 Te. 23. Reducing property of dioxide decreases from SO 2 to TeO 2 . 24. H 2 O is a liquid and H 2 S a gas. 25. SO 2 is more reducing than TeO 2 . 26. SF 6 is kinetically stable or chemically inert. 27. Ozone is a powerful oxidising agent. 28. In vapour state sulphur shows paramagnetic behaviour. 29. Ka 2 << Ka 1 for H 2 SO 4 in water. 30. SO 2 gas decolourises acidified potassium permanganate solution. 31. Dioxygen is a gas while sulphur is a solid. NGM (2015-2016)
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CBSE class 12 lesson P block notes
Transcript of Worksheet on p Block
WORKSHEET BY NANCY GEORGE (BSSS)
Important Questions of p-BLOCK
Account for the following:
1. Nitrogen does not form pentahalides. 2. Pentahalides are more covalent than trihalides.3. BiH3 is strongest reducing agent among the hydrides of group 15 elements.4. NH3 has higher boiling point than PH3. 5. Phosphorus undergoes greater extent of catenation than Nitrogen.6. The N-N single bond is weaker than the P-P bond.7. Nitrogen is inert at room temperature.8. R3P=O exists but R3N=O does not exist.9. White phosphorus is less stable and more reactive than red phosphorus.10. Bond angle in PH4
+ is higher than in PH3.11. PCl3 & PCl5 fumes in moist air.12. The five bonds in PCl5 are not equivalent.13. In solid state, PCl5 exists as an ionic solid.14. H3PO4 is tribasic, H3PO3 is dibasic and H3PO2 is monobasic.15. H3PO2 (Hypophosphorus acid) is a reducing acid.16. PH3 is basic in nature.17. R3P=O exists but not R3N=O.18. Oxygen has less electron gain enthalpy than sulphur.19. Acidic character increases from H2O to H2Te.20. H2S is less acidic than H2Te.21. Thermal stability of hydrides also decreases from H2O to H2Po.22. Reducing character increases from H2S to H2Te.23. Reducing property of dioxide decreases from SO2 to TeO2.24. H2O is a liquid and H2S a gas.25. SO2 is more reducing than TeO2.26. SF6 is kinetically stable or chemically inert.27. Ozone is a powerful oxidising agent.28. In vapour state sulphur shows paramagnetic behaviour.29. Ka2 << Ka1 for H2SO4 in water.30. SO2 gas decolourises acidified potassium permanganate solution.31. Dioxygen is a gas while sulphur is a solid.
Draw and Learn the following structures:Oxides of nitrogenWhite Phosphorus and Red PhosphorusOxoacids of phosphorusS8 ring and S6 cyclic structures
Write the anomalous properties of a) Nitrogen b) Oxygen
Arrange the following in the increasing order of the property indicated:Hydrides of group 15 (thermal stability, basic strength, reducing character)Hydrides of group 16 (thermal stability, acidic strength, reducing character)
NGM (2015-2016)
WORKSHEET BY NANCY GEORGE (BSSS)
Bond dissociation enthalpy of halogensAcidic strength of hydrogen halidesAcidic strength of oxoacids of chlorine
Learn the following preparations & Write the conditions to maximize the yield of HNO3 by Ostwald’s processH2SO4 by Contact’s process NH3 by Haber’s process
Write reactions for the following:1) Heating of white phosphorus with conc NaOH in an inert atmosphere of CO2
3) Reducing action of SO2 a) Fe2+ to Fe3+ b) decolourising KMnO4 solution.4) Reducing property of H3PO2.
GROUP 17 & 18
Account for the following:
1. Halogens have maximum negative electron gain enthalpy in their respective periods.2. Halogens are coloured.3. Halogens are strong oxidising agents.6. Among halogens, F is the strongest oxidising agent although its ∆eg H is less than Cl.7. Fluorine exhibits only -1 oxidation state while other halogens exhibit higher positive oxidation states.8. Bond dissociation enthalpy of F2 is lesser than that of Cl2.9. Fluorine forms only one oxo acid HOF.10. Acidic strength of acids increases from HF<HCl<HBr<HI.12. Interhalogen compounds are more reactive than halogens.13. ICl is more reactive than I2.14. Chlorine water loses its yellow colour on standing.15. Chlorine water has both oxidising and bleaching properties.16. Bleaching by chlorine is permanent while bleaching by sulphur dioxide is temporary.17. HCl reacts with finely powdered iron to form ferrous chloride and not ferric chloride.18. BrF3 and ClF3 have slightly bent ‘T’ shape.
Draw and Learn the following structures:Oxoacids of chlorineBrF3 & ClF3
Xenon compounds (Fluorides, Oxide & Oxyfluoride)
Write the anomalous properties of fluorine
Write reactions for the following:1) Action of chlorine with hot and conc. NaOH. 2) Hydrolysis reactions of XeF4 and XeF6. 3) NaCl is heated with sulphuric acid in the presence of MnO2.
NGM (2015-2016)
WORKSHEET BY NANCY GEORGE (BSSS)
4) Chlorine gas is passed into a solution of NaI in water.
NGM (2015-2016)
