JEE Main · 2023 · Shift-ImediumPB12-029

Inert gases have positive electron gain enthalpy. Its correct order is

p-Block Elements (Class 12) · Class 12 · JEE Main Previous Year Question

Question

Inert gases have positive electron gain enthalpy. Its correct order is

Options
  1. a

    Xe<Kr<Ne<He\mathrm{Xe < Kr < Ne < He}

  2. b

    He<Ne<Kr<Xe\mathrm{He < Ne < Kr < Xe}

  3. c

    He<Xe<Kr<Ne\mathrm{He < Xe < Kr < Ne}

    ✓
  4. d

    He<Kr<Xe<Ne\mathrm{He < Kr < Xe < Ne}

Correct Answerc

He<Xe<Kr<Ne\mathrm{He < Xe < Kr < Ne}

Detailed Solution

Strategy: Rank noble gases by their positive electron gain enthalpy values.

Step 1: Trend and values Noble gases have completely filled shells and hence high positive ΔegH\Delta_{eg}H values:

  • \ceHe:+48 kJ/mol\ce{He}: +48 \text{ kJ/mol}
  • \ceXe:+77 kJ/mol\ce{Xe}: +77 \text{ kJ/mol}
  • \ceKr:+96 kJ/mol\ce{Kr}: +96 \text{ kJ/mol}
  • \ceNe:+116 kJ/mol\ce{Ne}: +116 \text{ kJ/mol}

Step 2: Ordering The correct increasing order of positivity is: \ceHe<Xe<Kr<Ne\ce{He < Xe < Kr < Ne}.

Answer: (Option) [c] \ceHe<Xe<Kr<Ne\boxed{\text{Answer: (Option) [c] $\ce{He < Xe < Kr < Ne}$}}

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