UNIT 3: Periodic Classification Of Elements - Online Test

Q1. Which one of the following is the least electronegative element?
Answer : Option D
Explaination / Solution:
No Explaination.


Q2. The element with positive electron gain enthalpy is
Answer : Option C
Explaination / Solution:
No Explaination.


Q3. The correct order of decreasing electronegativity values among the elements X, Y, Z and A with atomic numbers 4, 8 , 7 and 12 respectively
Answer : Option A
Explaination / Solution:
No Explaination.


Q4.

Assertion: Helium has the highest value of ionisation energy among all the elements known

Reason: Helium has the highest value of electron affinity among all the elements known
Answer : Option C
Explaination / Solution:
No Explaination.


Q5. The electronic configuration of the atom having maximum difference in first and second ionisation energies is
Answer : Option A
Explaination / Solution:
No Explaination.


Q6. Which of the following is second most electronegative element?
Answer : Option A
Explaination / Solution:
No Explaination.


Q7. IE1 and IE2 of Mg are 179 and 348 kcal mol-1 respectively. The energy required for the reaction Mg → Mg2+ + 2 e- is
Answer : Option C
Explaination / Solution:
No Explaination.


Q8. In a given shell the order of screening effect is
Answer : Option A
Explaination / Solution:
No Explaination.


Q9. Which of the following orders of ionic radii is correct?
Answer : Option D
Explaination / Solution:
No Explaination.


Q10. The First ionisation potential of Na, Mg and Si are 496, 737 and 786 kJ mol-1 respectively. The ionisation potential of Al will be closer to
Answer : Option B
Explaination / Solution:
No Explaination.