NTA Abhyas JEE Main2020ChemistryClassification of Elements and Periodicity in PropertiesPractice
Which of the following transformation least energy is required?
Options
- AF ( g ) - → F ( g ) + e -
- BP ( g ) - → P ( g ) + e -
- CS g - → S g + e -
- DC l g - → C l g + e -
Correct answer
B. P ( g ) - → P ( g ) + e -
Step-by-step solution
If we consider the opposite process A F g + e - → F ( g ) - ; ∆ H 1 B P g + e - → P g - ; ∆ H 2 C S g + e - → S g - ; ∆ H 3 D C l g + e - → C l g - ; ∆ H 4 Order of energy releases is : ∆ H 4 > ∆ H 1 > ∆ H 3 > ∆ 2 So, P ( g ) - → P ( g ) + e - ; Requires least energy.