Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test General Science Chemistry Periodic Table
The correct order of first ionisation enthalpy value for elements of II period is:
1
B < Be < C < O < N
2
Be < B < N < C < O
3
Be < B < C < N < O
4
More than one of the above
5
None of the above