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ChemistryJEE Main 2 Apr 2026, Shift 1·Q4·MCQ·Moderate

Thermodynamics · Hess law enthalpy of formation

Consider the following data

(i) 2 Al(s)+6 HCl(aq)→AlX2ClX6(aq)+3 HX2(g)\ce{2Al(s) + 6HCl(aq) -> Al2Cl6(aq) + 3H2(g)} + 1200 kJ/mol.

(ii) HX2(g)+ClX2(g)→2 HCl(g)\ce{H2(g) + Cl2(g) -> 2HCl(g)} + 164 kJ/mol.

(iii) HCl(g)+aq→HCl(aq)\ce{HCl(g) + aq -> HCl(aq)} + 83 kJ/mol.

(iv) AlX2ClX6(s)+aq→AlX2ClX6(aq)\ce{Al2Cl6(s) + aq -> Al2Cl6(aq)} + 663 kJ/mol.

The enthalpy of formation of anhydrous solid AlX2ClX6\ce{Al2Cl6} is :

  1. (1)−648-648 kJ mol−1^{-1}
  2. (2)−1350-1350 kJ mol−1^{-1}
  3. (3)−2002-2002 kJ mol−1^{-1}
  4. (4)−1527-1527 kJ mol−1^{-1}

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See the full 2 Apr 2026, Shift 1 paper