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Which of the following statements are correct? A. The process of adding an electron to a neutral gaseous atom is always exothermic. B. The process of removing an electron from an isolated gaseous atom is always endothermic. C. The 1st ionization energy of boron is less than that of beryllium. D. The electronegativity of C is 2.5 in CH4 and CCl4. E. Li is the most electropositive among elements of group I. Choose the correct answer from the options given below: (1) B and D Only (2) B, C and E Only (3) A, C and D Only (4) B and C Only

1. B and D Only
2. B, C and E Only
3. A, C and D Only
4. B and C Only

Correct answer: B and C Only

Solution

Option B is correct because removing an electron from an atom requires energy, making it an endothermic process, and option C is correct as boron has a lower first ionization energy than beryllium due to its electron configuration and position in the periodic table.

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