Home › CBSE Class 11 › Chemistry › Mechanical Properties of Fluids › Per NCERT §5.5(d), the LATTICE ENTHALPY of an io…
Per NCERT §5.5(d), the LATTICE ENTHALPY of an ionic compound is defined as the enthalpy change for which process?
ANa(s) → Na(g)
BOne mole of solid ionic compound → gaseous constituent ions, e.g. NaCl(s) → Na⁺(g) + Cl⁻(g); Δ_latt H° = +788 kJ/mol
CCl(g) + e⁻ → Cl⁻(g)
DNaCl(s) → Na(s) + Cl₂(g)
Answer & Solution
Correct answer: B. One mole of solid ionic compound → gaseous constituent ions, e.g. NaCl(s) → Na⁺(g) + Cl⁻(g); Δ_latt H° = +788 kJ/mol
Per NCERT §5.5(d), Δ_latt H°: NaCl(s) → Na⁺(g) + Cl⁻(g) = +788 kJ/mol. Determined via Born-Haber cycle (cannot be measured directly).
Related questions
A wet paint brush forms a fine tip when lifted from water. This is due to:Surface tension is a property of:Honey needs a bigger force than oil to slide a plate at the same speed. Honey is more:Plaque narrows an artery, blood speeds up there and pressure drops. The artery may:Water leaves a hole in an open tank at the speed of a freely falling body. This is:Above a limiting speed called the critical speed, flow becomes:Where a pipe narrows and streamlines crowd together, the fluid speed:The equation of continuity, Av = constant, expresses conservation of: