CBSE Class 10 Answered

Dear Aksa, Entire syllabus is important in s and p-block elements. Please go through the chapter notes, textbook questions, live test series, model tests, and chapter tests to make the concepts more clear. For this log on to www.topperlearning.com Go through the properties of both s and p block elements and do comparative study. Properties are mostly asked. s- Block Elements Entire syllabus p-Block Elements Structures of Oxoacids: phosphorus (2007), sulphur (2007), Structures of Fluoride: sulphur (2008), xenon (2008, 2009), bromine (2009) Interhalogen compounds (2007) Basicity of group 15 elements (2008, 2009) Most important topics/questions 1. Structures of PCl5, H2SO3, H2SO4, H2S2O8, H2S2O7, HOCl, HClO2, HClO3, HClO4 2. Complete the reactions: 3. Conceptual questions: • NF3 is an exothermic compound whereas NCl3 is not. • NH3 is a stronger base than PH3. Why? • Arrange the following in order of the indicated property: F2, Cl2, Br2, I2 in increasing order of bond dissociation enthalpy HF, HCl, HBr, HI in increasing order of acidic strength NH3, PH3, AsH3, SbH3, BiH3 in increasing order of basic strength • What are interhalogen compounds?