CBSE Class 6 Answered

Hi Prarthana,

Entire syllabus is important in s and p-block elements. Please go through the NCERT questions, live test series, model tests, and chapter tests to make the concepts more understandable.

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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?

The important topics/sections/questions from d and f-block elements are:

• Why is Ce (IV) good analytical reagent?
• General trends in the properties of transition and inner transition elements.

• Ionisation energies and ionisation enthalpies.
• Standard electrode potential (E^o) and Chemical reactivity of both d and f block elements
• Complex formation
• Alloy formation
• Salts containing oxoanions of transition metals.

• Why is the absorption bands narrow in f elements?
• What happens at the third ionization enthalpy of f block elements?
• List the irregularities in the actinide series compared to the lanthanide?
• Compare the different characteristic of lanthanides and actinides?
• Actinide contraction is greater from element to element than lanthanide contraction. Why?
• List some practical applications of f block elements?
• The chemistry of the actinide elements is not as smooth as that of the lanthanides. Justify?
• Oxidation states of lanthanoids and actinoids

Hope this helps!!