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Solution


Q.

Which of the following statements are correct                                                   [2025]

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 C only  
2 A, C and D only  
3 B and D only  
4 B, C and E only  

Ans.

(1)

(A) For noble gases, N, Be and Mg electron affinity is negative i.e. energy is absorbed when an electron is added to an isolated neutral atom.

(C) It is slightly more difficult to remove an electron from fully filled 2s2 orbital of Be (1s22s2) than from 2p1 orbital of B (1s22s22p1). Thus first ionization energy of B is less than that of Be.

(D) Four Cl atoms increase the partial positive charge on C hence increase its electronegativity. Thus electronegativity of C in CCl4>CH4.

(E) Cs is most electropositive element of group 1.