In each sub question below a statement S and an explanation E is given. Choose the correct answer from the codes A, B, C, D, E given below for each question.<br>(A) S is correct but E is incorrect<br>(B) S is incorrect but E is correct<br>(C) Both S and E are correct and E is correct explanation of S<br>(D) Both S and E are correct but E is not correct explanation of S<br>(E) Both S and E are incorrect<br>i) S - The third period contains only 8 elements and not 18 like $$4^{\text{th}}$$ period. E - In III period filling starts from $$3s^1$$ and complete at $$3p^6$$ whereas in IV period it starts from $$4s^1$$ and complete after $$3d^{10}$$ and $$4s^2$$<br>ii) S - Transition elements show horizontal as well as vertical relationship. E - This is due to shielding effect and similar electronic configuration<br>iii) S - Cs and $$\text{F}_2$$ combines violently to form CsF. E - Cs is most electropositive and F is most electronegative<br>iv) S - A jump in $$3^{\text{rd}}$$ ionisation energy is noticed in case of alkaline earth metals. E - The jump in ionisation energy is due to change in major energy shell during successive removal of electron<br>v) S - First ionisation energy of Be is more than that $$\text{IE}_1$$ of B. E - Removal of electron in Be occurs from 2s subshell whereas in B from 2p subshell<br>vi) S - Formation of $$\text{Cl}^-$$ is exothermic whereas formation of $$\text{O}^{2-}$$ endothermic. E - $$\text{EA}_2$$ of oxygen is endothermic and greater than its exothermic value $$\text{EA}_1$$ of oxygen<br>vii) S - $$\text{BiCl}_5$$ does not exist. E - In Bi inert pair effect is more predominant<br>viii) S - Second EA for halogens is zero. E - Fluorine has maximum value of electron affinity