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  • Chromyl chloride test is performed for the confirmation of the presence of the following in a mixture:Option: 1 Sulphate<div class='qna

Chromyl chloride test is performed for the confirmation of the presence of the following in a mixture:

Option: 1

Sulphate


Option: 2

Chromium


Option: 3

Chloride


Option: 4

Both b & c


Answers (1)

best_answer

As we learnt

 

Test of Chloride -

 

KCl + H_2SO_4\rightarrow KHSO_4 +HCl

K_2Cr_2O_7 +H_2SO_4\rightarrow K_2SO_4 +2CrO_3 +H_2O

2CrO_3 + 2HCl\rightarrow CrO_2Cl_2 +H_2O \: (Chronyl chloride)

CrO_2Cl_2 +4OH^- \rightarrow CrO^{2-}_4 (yellow) + 2Cl^{-} +H_2O

Pb^{2+}+CrO^{2-}_4 \rightarrow PbCrO_4 (yellow)

- wherein

The red colour of Chromyl Chloride and yellow colour of PbCrO_4 indicates the presence of Cl^-

 

 

chromyl chloride test is performed for the confirmation of the presence of Cl^- in a mixture

Posted by

himanshu.meshram

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