Qualitative Analysis - Result Question 26

####26. The pair(s) of ions where both the ions are precipitated upon passing H2S gas in presence of dilute HCl, is (are)

(a) Ba2+,Zn2+

(b) Bi3+,Fe3+

(c) Cu2+,Pb2+

(d) Hg2+,Bi3+

(2015 Adv.)

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Solution:

  1. Only radicals of I and II group of qualitative analysis get precipitated with H2S in the presence of dilute HCl.

(c) Cu2++H2SH+CuS

Pb2++H2SH+PbS

(d) Hg2++H2SH+HgS Black

Bi3++H2SH+Bi2S3 Brown ppt 

Ba2+,Zn2+ and Fe3+ are not precipitated as sulphide.



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