3 public questions tagged with this topic.
Thermal stability of group 1 carbonates increases down the group due to larger cation size stabilizing the lattice. Cs₂CO₃ is the most stable among Li, Na, K, and Cs carbonates.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Modern Periodic Law and Present Form - Long Form Periodic Table
Thermal stability of group 15 pentoxides (X₂O₅) decreases down the group due to weaker X-O bonds. N₂O₅ is the most stable thermally, decomposing at a higher temperature than P₂O₅, As₂O₅, or Sb₂O₅.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Modern Periodic Law and Present Form - Long Form Periodic Table
Thermal stability of group 15 hydrides decreases down the group due to weaker X-H bonds. BiH₃ (Bi, largest) has the lowest stability among NH₃, PH₃, AsH₃, and BiH₃.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Anomalous Properties and Second Period and Chemical Reactivity
