Question

The ionic bonds $X^{+}{Y}^{-}$ are formed when
(I) electron affinity of $Y$ is high
(II) ionization energy of $X$ is low
(III) lattice energy of $XY$ is high
(IV) lattice energy of $XY$ is low

• A. I and II
• B. I and III
• C. I, II and III
• D. All

Answer 1

Answer: (C)

I, II and III

Ionic bond $X^{+}{Y}^{-}$ forms when X looses electron easily. So ionization energy of X should be low and Y should gain electrons easily. So electron affinity of Y should be high. Also, during bond formation between them, high energy should be emitted, so, lattice energy of XY should be high.