Chapter 6, Problem 58A

Interpretation Introduction

Interpretation:

The equation representing the first ionization enthalpy of alkali metal is to be identified.

Concept Introduction :

The first ionization energy is the energy needed for the removal of the outermost electron from the neutral gaseous atom.

  $X\left(g\right)+I{E}_1\to X^{+}\left(g\right)+e^{-}$

Answer to Problem 58A

Option (c)

Explanation of Solution

The elements belonging to group 1 are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), and Cesium.

Thus, the first ionization enthalpy of alkali metal from the given is as shown:

  $\text{K}\to {\text{K}}^{+}+e^{-}$

So. Option (c) is correct.

Conclusion

Option (a) is incorrect as Cl belongs to the halogen family.

Option (b) is incorrect as Ca is an alkaline earth metal.

Option (d) is incorrect as H is not an alkali metal.