First slide

Periodic Trends

Question

Energy is absorbed in all the following processes except

Moderate

A

$Cl (g) \to {Cl}^{+} (g)$
B

$N (g) \to N^{-} (g)$
C

$O (g) \to O^{-} (g)$
D

$I^{-} (g) \to I (g)$

Solution

(1) ….IP….Endothermic
(2)…. $∆ H_{eg}$ of Be,Mg,N,Nobles gases is positive due to stable configuration;
(3)…. $O (g) \to O^{-} (g), ∆ H = - 141 kJ / mole$ ;
(4)…..I(g) $\to$ I^-(g), $∆ H$ = -296 kJ/mole ….reverse reaction is endothermic ;

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