9. Among the following diatomic molecules, how many molecules will their bond length decrease when they obtain one extra electron? Li2, B2, C2, N2, O2, F2, NO, CN (A) 2 (B) 3 (C) 4 (D) 5 (E) 6

9. Among the following diatomic molecules, how many molecules will their bond length decrease when they obtain one extra electron? Li₂, B₂, C₂, N₂, O₂, F₂, NO, CN
(A) 2
(B) 3
(C) 4
(D) 5
(E) 6

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18. Which is the correct statement for the second law of thermodynamics? (A) In any cyclic process the entropy will either decrease or remain the same. (B) A system's entropy approaches a constant value as its temperature approaches absolute zero. (C) If two systems are in thermal equilibrium with a third system, then they are in thermal equilibrium with each other. (D) In a thermodynamic process involving a closed system, the increment in the internal energy is equal to the difference between the heat accumulated by the system and the work done by it. (E) It is impossible for a system to receive a given amount of heat from a high-temperature reservoir and provide an equal amount of work output.

9. Among the following diatomic molecules, how many molecules will their bond length decrease when they obtain one extra electron? Li₂, B₂, C₂, N₂, O₂, F₂, NO, CN
(A) 2
(B) 3
(C) 4
(D) 5
(E) 6

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9. Among the following diatomic molecules, how many molecules will their bond length decrease when they obtain one extra electron? Li2, B2, C2, N2, O2, F2, NO, CN(A) 2(B) 3(C) 4(D) 5(E) 6

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9. Among the following diatomic molecules, how many molecules will their bond length decrease when they obtain one extra electron? Li₂, B₂, C₂, N₂, O₂, F₂, NO, CN
(A) 2
(B) 3
(C) 4
(D) 5
(E) 6