Question
Chemistry Question on p -Block Elements
Which of the following order is wrong :
A
NH3 < PH3 < AsH3 – Acidic
B
Li < Be < B < C – Ist IP
C
Al2O3 < MgO < Na2O < K2O - Basic
D
Li+< Na+< K+< Cs+- Ionic radius
Answer
Li < Be < B < C – Ist IP
Explanation
Solution
The correct option is (B) : Li < Be < B < C – Ist IP
Li⟶1s22s1; Be⟶1s22s2;B⟶1s22s22p1;C⟶1s22s22p2
Li<B<Be<C
Be is having higher ionization potential than B as Be has fully filled 2s− orbital due to which it gets extra stability.