TOPIC — PERIODIC PROPERTIES

Class – XI


1. The ionic radii of N³- , 0²- ,F- and Na+ follow the order:


ANS :‐  N³- > 0²- >F- > Na+


2. Which of the following oxides will be more acidic in nature ? 


ANS :-  Cl207


3. Which of the following halogen has the most negative electron gain enthalpy ? 


ANS :- CI


4. Which of the following alkaline earth metal sulphates is the least soluble in water ? 


ANS :- BaSO4


5. Which of the following order is correct for ionisation energy ?


ANS :- B< Be <C<O<N 


6. The most electronegative element of third period is 


ANS : - CI


7. Which one of the following is correct order of size?


ANS : - I‐ >I > I+¹


8. The correct order of second ionisation energy of C, N, O and F is


ANS : - O >F>N>C 


9. Which of the following alkali metal is the strongest reducing agent ?


ANS : - LI


10. Which of the following has tendency to form unipositive ion ?


ANS : - I