EasyRe-NEET 2026
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The correct order of solubility of the given salts in water at 298 K is
A
Hg₂Cl₂ > Zn(OH)₂ > AgBr
B
AgBr > Zn(OH)₂ > Hg₂Cl₂
C
Hg₂Cl₂ > AgBr > Zn(OH)₂
D
Zn(OH)₂ > AgBr > Hg₂Cl₂
Explanation
Salt ⇒ AgBr(s) → Ag⁺(aq.) + Br(aq.) Ksp = S² ⇒ S₁ = √Ksp = √5 × 10⁻¹³ = √50 × 10⁻¹⁴ = 7.1 × 10⁻⁷ M Salt ⇒ Zn(OH)₂(s) → Zn²⁺(aq.) + 2OH⁻(aq.) Ksp = 4S³ ⇒ S₂ = (Ksp/D)¹ᐟ³ = (1.0 × 10⁻¹⁵/D)¹ᐟ³ S₂ = (250 × 10⁻¹⁸)¹ᐟ³ = 6.3 × 10⁻⁶ M Salt ⇒ Hg₂Cl₂(s) → Hg₂²⁺(aq.) + 2Cl⁻(aq.) Ksp = 4S³ ⇒ S₃ = (Ksp/D)¹ᐟ³ = (1.3 × 10⁻¹⁸/D)¹ᐟ³ S₃ = (325 × 10⁻²¹)¹ᐟ³ = 6.9 × 10⁻⁷ M ∴ Order of solubility ⇒ Zn(OH)₂ > AgBr > Hg₂Cl₂
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