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Which of the following statements is/are incorrect ?A. In thiourea test for nitrite , a green coloured solution is obtainedB. It is not necessary to carry out the chromyl chloride test in a dry test tubeC. In `PbNO_3` , the brown ring test can be performed with its water extractD. Suspension of `CdCO_3` gives black precipitate with sodium sulphide solution |
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Answer» Correct Answer - A,B,C,D (A)It is deep red colouration due to the formation of `Fe(SCN)_3` (B)In presence of moisture following reaction will occur : `CrO_2 Cl_2 + H_2O to H_2CrO_4 + HCl` , So test is carried out only in dry test tube. (C )White precipitate of `PbSO_4` is formed & hence brown ring is not visible. (D)Gives yellow precipitate of CdS. |
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