Qualitative Analysis - Result Question 33

####34. M1,Q and R, respectively are

(a) Zn2+,KCN and HCl

(b) Ni2+,HCl and KCN

(c) Cd2+,KCN and HCl

(d) Co2+,HCl and KCN

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Answer:

Correct Answer: 34. (5.92BM)

Solution:

  1. PLAN This problem can be solved by using concept of chemical reactions of transition metal ions (,) colour and structure of transition metal compounds.

Here, among given four option Ni2+ and Zn2+ has ability to form tetrahedral as well as square planar complex depending upon types of reagent used.

Ni2+ on reaction with KCN forms square planar complex [Ni(CN)4]2 due to strong field strength of CN.

Ni2++KCN[Ni(CN)4]2 Square planar 

While on reaction with HCl,Ni2+ forms stable tetrahedral complex [Ni(Cl)4]2.

Zn2+, on the other hand, on reaction with KCN as well as HCl produces tetrahedral complex because of its d10 electronic configuration.

Complete reaction sequence can be shown as



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