exothermic

Which of the following is the most exothermic reaction when dissolved in water ??

A. LiI
B.CsF
C. LiF
D. CsI

3 Answers

B. CsF ?

is it becoz it has strongest bond ?

by the way,dude, eureka is right.but there's a general explanation given by by Born-Lande equation.

It gives the expression for lattice energy for ionic compouds. U= - N₀Az⁺z^-e² / r + N₀B/r

it says : a) the lattice energy becomes more negative(lattice becomes stronger), as r,the interionic distance increases

b)the lattice energy directly depends on product of ionic charges ( not in effect here )

c)high melting point and bond strength are measures of high lattice energy

here,using the first and third point,u cn get the answer CsF.(note this equation is for all ionic compounds)

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