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The questions given below contain sta...

The questions given below contain statement -1 (Assertion ) and statement -2 (Reason ) . It has four options (a), (b) , ( c) and (d ) out of which ONLY ONE is correct . Choose the correct option as.
Statement -1 . Of all the elements helium has the highest value of first ionization enthalpy
Statement-2 Helium has the most positive electron gain enthalpy of all the element s.

A

Statement -1 is True Statement -2 is True , Statement -2 is correct explanation for Statement -5

B

Statement -1 is True Statement -2 is True , Statement -2 is not a correct explanation for Statement -5

C

Statement -1 is True Statement -2 is False

D

Statement -1 is False Statement -2 is True

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both statements and determine their truthfulness and relationship. ### Step 1: Analyze Statement 1 **Statement 1:** "Of all the elements, helium has the highest value of first ionization enthalpy." - **Explanation:** Ionization enthalpy is the energy required to remove an electron from an atom. Helium, being a noble gas with a small atomic size and a fully filled valence shell (1s²), has a very high ionization energy. In fact, it is the highest among all elements. ### Step 2: Analyze Statement 2 **Statement 2:** "Helium has the most positive electron gain enthalpy of all the elements." - **Explanation:** Electron gain enthalpy is the energy change when an electron is added to an atom. For helium, which also has a fully filled valence shell, adding an electron would require energy input rather than releasing energy, making its electron gain enthalpy positive. This is true, as noble gases generally have positive electron gain enthalpies due to their stable electronic configurations. ### Step 3: Determine the Relationship Between the Statements - Both statements are true: - Statement 1 is true because helium indeed has the highest first ionization enthalpy. - Statement 2 is also true because helium has a positive electron gain enthalpy. However, Statement 2 does not provide a correct explanation for Statement 1. The reason for the high ionization energy of helium is not directly related to its positive electron gain enthalpy. ### Conclusion - Therefore, the correct answer is that both statements are true, but Statement 2 is not the correct explanation for Statement 1. ### Final Answer The correct option is **(b)**: Both statements are true, but Statement 2 is not the correct explanation for Statement 1. ---
To solve the question, we need to analyze both statements and determine their truthfulness and relationship. ### Step 1: Analyze Statement 1 **Statement 1:** "Of all the elements, helium has the highest value of first ionization enthalpy." - **Explanation:** Ionization enthalpy is the energy required to remove an electron from an atom. Helium, being a noble gas with a small atomic size and a fully filled valence shell (1s²), has a very high ionization energy. In fact, it is the highest among all elements. ### Step 2: Analyze Statement 2 ...
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