JEE Advanced2015ChemistrySolutionsActual
If the freezing point of a 0.01 molal aqueous solution of a cobalt (III) chloride-ammonia complex (which behaves as a strong electrolyte) is - 0.0558 o C , the number of chloride(s) in the coordination sphere of the complex is [ K f   o f   w a t e r = 1.86   K   k g   m o l - 1 ]
Correct answer
1
Step-by-step solution
∆ T f = K f × i × m 0.0558 = 1.86 × i × 0.01 i = 3 Given complex behaves as a strong electrolyte α = 100 % n = 3 (no. of particles given by complex) ∴ complex is C o N H 3 5 C l C l 2 no. of C l - ions in the co-ordination sphere of the complex = 1