Complex A has a composition of H12O6Cl3Cr. If the complex on treatment with conc. H2SO4 loses 13.5% of its original mass, the correct molecular formulas of A is: [Given : atomic mass of Cr = 52 amu an

Question

Complex A has a composition of H12O6Cl3Cr. If the complex on treatment with conc. H2SO4 loses 13.5% of its original mass, the correct molecular formulas of A is: [Given : atomic mass of Cr = 52 amu and Cl = 35 amu]

(A) [Cr(H2O6]Cl3
(B) [Cr(H2O)4Cl2]Cl 2H2O
(C) [Cr(H2O)3Cl3] 3H2O
(D) [Cr(H2O)5Cl]Cl2 H2O

Prashant Kotian · Accepted Answer

Correct answer: B. Conc. H2SO4 acts as dehydrating agent. Molar mass of given complex = 266.5 g/mol. On treating with conc. H2SO4 the mass lost by the complex = g ) . ( 5 .  = 2 moles of H2O Formula of the complex = [Cr(H2O)4Cl2]Cl 2H2O

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