Question
For which one of the processes represented by the following equations the enthalpy (heat) change is likely to be negative
BITSAT
Chemistry
Thermodynamics (C)
2020
BITSAT 2020
BITSAT Chemistry Question (2020) — Solution
Options
- A. Cl ^ - ( g )+ aq Cl ^ - ( aq )
- B. Cl ( g ) Cl ^ + ( g )+ e ^ -
- C. 1 / 2 Cl _ 2 ( ~g ) Cl ( g )
- D. Cl _ 2 ( l ) Cl _ 2 ( ~g )
Answer
A. Cl ^ - ( g )+ aq Cl ^ - ( aq )
Step-by-step solution
Gaseous ions, when dissolved in water, get hydrated and heat is evolved (heat of hydration). Cl ^ - ( g )+ aq Cl ^ - ( aq ) is such reaction
Related: Chemistry — Thermodynamics (C) · All PYQ Banks