Most Important Selected Qs for JEE AdvancedChemistryThermodynamics (C)
Identify the correct statement(s):
Options
- AThe oxidation number of Cr in CrO ₅ is +6
- BH> U for the reaction N₂ O₄(g) 2 N O₂(g) provided both gases behave ideally.
- CpH of 0.1 N H ₂ SO ₄ is less than that of 0.1 ~N~ HC at 25^ C
- D( R T F )=0.0591 volt at 25^ C
Correct answer
B. H> U for the reaction N₂ O₄(g) 2 N O₂(g) provided both gases behave ideally.
Step-by-step solution
In CrO ₅ oxidation no. of Cr is +6. (b) For the reaction (in ideal case) array r N ₂ O ₄(g) 2 NO ₂(g) H= U+p V array H= U+ n_ g R T ( p V= n_ g R T ) Where, n_ g = (gaseous moles of product)-(gaseous moles of reactant) n_ g =2-1=1 Thus, H> U (c) p H of 0.1 N H ₂ SO ₄ is less than of 0.1 ~N~HCl at 25^ is a wrong statement. pH of H ₂ SO ₄ pH =- [ H ⁺ ]=- [ l 0⁻² ] (N=C Z) and (Z=2 . for . H ₂ SO ₄ ) pH =2 and pH of HCl pH =- [ l 0⁻¹ ]=1 Thus, pH of H ₂ SO ₄> pH of HCl . (d) R T F =0.0591 at 25^ C is a wrong statement