Which of the following statement(s) is(are) incorrect? (a) In thiou...

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Which of the following statement(s) is(are) incorrect?
(a) In thiourea test for nitrite, a green colored solution is obtained
(b) It is not necessary to carry out the chromyl chloride test in a dry test tube
(c) In \( \mathrm{PbNO}_{3} \), the brown ring test can be performed with its water extract
(d) Suspension of \( \mathrm{CdCO}_{3} \) gives black ppt. with sodium sulphide solution
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