p-Block Elements
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See all →- Given below are two statements :Statement I : Like nitrogen that can form ammonia, arsenic can form arsine.Statement II : Antimony cannot form antimony pentoxide.In the light of the above statements, choose the most appropriate answer from the option… Answer: 3. Statement I is correct but Statement II is incorrect Key idea: group 15 elements form hydrides EH₃ and oxides E₂O₅ . Statement I... 1
- The products A and B obtained in the following reactions, respectively, are3ROH + PCl_3 → 3RCl + AROH + PCl_5 → RCl + HCl + B Answer: 1. H₃PO₃ and POCl₃ Key idea: phosphorus halides convert ROH into RCl, and the phosphorus part ends as an acid or oxychloride. 3ROH+P... 1
- Given below are two statements:Statement I : The boiling point of hydrides of Group 16 elements follow the orderH_2O > H_2Te > H_2Se > H_2S.Statement II : On the basis of molecular mass, H_2O is expected to have lower boiling point than the other mem… Answer: 2. Both Statement I and Statement II are true. Key idea: boiling point of hydrides depends on H-bonding and on molecular mass. H₂O i... 1
- Among Group 16 elements, which one does NOT show -2 oxidation state? Answer: 1. Po Key idea: metallic character increases down the group, so the -2 state becomes unfavourable. O, S, Se and Te form oxides, sulp... 1
- Given below are two statements :Statement I : The nutrient deficient water bodies lead to eutrophication.Statement II : Eutrophication leads to decrease in the level of oxygen in the water bodies.In the light of the above statements, choose the corre… Answer: 1. Statement I is incorrect but Statement II is true. Key idea: Eutrophication is caused by nutrient enrichment. Statement I is fals... 1
- Match List - I with List - II :List - I (Oxoacids of Sulphur): A. Peroxodisulphuric acid B. Sulphuric acid C. Pyrosulphuric acid D. Sulphurous acidList - II (Bonds): I. Two S-OH, Four S=O, One S-O-S II. Two S-OH, One S=O III. Two S-OH, Four S=O, One… Answer: 3. A-III, B-IV, C-I, D-II Key idea: Draw the structure of each oxoacid. A. H₂S₂O₈ , peroxodisulphuric: two S-OH, four S=O and one S-... 1