Question

Which of the following process is endothermic? (A) Nao → + Nag) (B) KI K (9) (C) Lio → Lig (D) So S-2​

Answer 1

Answer:

option B .

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Answer 2

Answer:

(A) Nao → + Nag)

Explanation:

For example

The following are examples of endothermic reactions. They have a positive value of electron gain enthalpy and energy is absorbed when an electron is added to the atom.

Ne(g)+e  −  (g)→Ne  −  (g)

N(g)+e  −  (g)→N  −  (g)

The following is an example of an exothermic reaction. They have a negative value of electron gain enthalpy and energy is released when an electron is added to the atom.

S  −  (g)+e  −  (g)→S  2−  (g).

n an endothermic step, energy is absorbed.

(A) The reaction S  −  (g)→S  2−  (g) represents endothermic step as the energy is absorbed when an electron is added to monovalent anion to produce divalent anion.

The energy absorbed overcomes the force of electrostatic repulsion between monovalent anion and electron.

(B) The reaction Na  + (g)+CI  −  (g)→NaCI(s) represents exothermic step.  The energy released is equal to the lattice energy.

Lattice energy is the energy released when the requisite number of gaseous ions are converted into 1 mol of the crystalline lattice.

(C) The reaction N(g)→N  −  (g) represents an endothermic process.

It represents the electron affinity of N which is positive due to the extra stability of half filled orbitals.

(D) The reaction Al  2+  (g)→Al  3+ (g) represents an endothermic process as energy is required to remove an electron from dipositve ion.

It represents third ionization potential of Al.