JEE Main201910 Apr 2019Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual
The correct order of the first ionization enthalpies is:
Options
- AT i < M n < Z n < N i
- BT i < M n < N i < Z n
- CM n < T i < Z n < N i
- DZ n < N i < M n < T i
Correct answer
B. T i < M n < N i < Z n
Step-by-step solution
As we observe from left to right in a period, there is a gradual increase in ionization potential due to the increase in Nuclear charge. From left to right, the elements will be   Ti 22 ,   Mn 25 , Ni ( 28 ) , Zn ( 30 ) . Hence, the correct order will be: Ti < M n < Ni < Z n .