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Q.

The elevation of boiling point of 0.10 M aqueous CrCl₃.xNH₃ solution is two times that of 0.05 M aqueous CaCl₂ solution. The value of x is ____. [Assume 100% ionization of the complex and CaCl₂, coordination number of Cr as 6, and that all NH₃ molecules are present inside the coordination sphere]

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answer is 5.

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Detailed Solution

We have, ΔTb=i × Kb × m

2Tb= $i \times Kb \times 0.10$ --(1)

Tb= $i \times Kb \times 0.05$ --(2)
Therefore on solving (1) & (2)

i×0.1×Kb=3×0.05×Kb×2 ; (which is i=3)
Hence,[Cr(NH₃)5Cl]Cl₂ → [Cr(NH₃)5Cl]²⁺+Cl⁻

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The elevation of boiling point of 0.10 M aqueous CrCl3.xNH3 solution is two times that of 0.05 M aqueous CaCl2 solution. The value of x is ____. [Assume 100% ionization of the complex and CaCl2, coordination number of Cr as 6, and that all NH3 molecules are present inside the coordination sphere]