Which of the following statements are incorrect? (a) In thiourea test for nitrite, a green colou...

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Which of the following statements are incorrect?
(a) In thiourea test for nitrite, a green coloured solution is obtained.
(b) It is not necessary to carried out the chromyl chloride test in a dry test tube.
(c) Suspension of \( \mathrm{CdCO}_{3} \) gives black precipitate with \( \mathrm{Na}_{2} \mathrm{~S} \) solution. its water extract.
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