IMPORTANT TOPICS for Class XII Chemistry Board Exam: p, d and f Block elements

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 following reaction:
   • P₄ + NaOH + H₂O →
   • P₄ + SO₂Cl₂ →
   • POCl₃ + H2O→
   • KMnO₄ + HCl →
   • NaOH + Cl₂ →
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?

Chapter 8: The d- and f- Block Elements (5 marks)

• Variable oxidation states of transition elements (2007, 2008)
• Formation of coloured ions by transition metal ions (2007, 2010)
• Lanthanoid contraction (2007, 2008, 2009)
• Oxidation states of actinoids (2009, 2011)

NCERT questions which have been asked previously

21 comments March 10th, 2012