1. Tardigrade
  2. Question
  3. Chemistry
  4. Statement I F-atom has a less negative electron affinity than Cl-atom. Statement II Additional electrons are repelled more effectively by 3 p-electrons in Cl-atom than by 2 p-electrons in F- atom. (a) Statement 1 is true; Statement II is true; Statement II is the correct explanation of Statement I. (b) Statement 1 is true; Statement II is true; Statement II is not the correct explanation of Statement I. (c) Statement I is true; Statement II is false. (d) Statement I is false; Statement II is true.

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Q. Statement I $F$-atom has a less negative electron affinity than $Cl$-atom.
Statement II Additional electrons are repelled more effectively by $3 p$-electrons in $Cl$-atom than by $2 p$-electrons in $F$- atom.
(a) Statement 1 is true; Statement II is true; Statement
II is the correct explanation of Statement I.
(b) Statement 1 is true; Statement II is true; Statement
II is not the correct explanation of Statement I.
(c) Statement I is true; Statement II is false.
(d) Statement I is false; Statement II is true.

IIT JEEIIT JEE 1998Classification of Elements and Periodicity in Properties

Solution:

Statement I is true; Statement II is false.
$F$ atom has slightly lower affinity for the electron than chlorine. It is due to the reason that additional electrons are repelled more effectively by $2p$-electrons in $F$ than by $3p$ -electrons in $Cl$-atom