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JEE Main202310 Apr 2023Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R . Assertion A : The energy required to form Mg 2 + from Mg is much higher than that required to produce Mg + Reason R : Mg 2 + is small ion and carry more charge than Mg + In the light of the above statements, choose the correct answer from the options given below.

Options

  1. ABoth A and R are true but R is NOT the correct explanation of A
  2. BA is true but R is false
  3. CA is false but R is true
  4. DBoth A and R are true and R is the correct explanation of A

Correct answer

D. Both A and R are true and R is the correct explanation of A

Step-by-step solution

Mg have 2 electrons in valance shell and after donation of 2   electrons it converts into Mg 2 + ion and attains inert gas configuration, now to ionize one more electron from inert gas configuration is very difficult, hence it is easy to ionize Mg to   Mg 2 + . IE 2 is always greater than IE 1 because on removal of e - , size decreases and effective nuclear charge increases.So Assertion is correct. Mg 2 + is a smaller ion than Mg + and has a greater charge density. This means that Mg 2 + has a stronger at

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