The preliminary test of nitrite ion is performed by- \( \mathrm{P} ...

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The preliminary test of nitrite ion is performed by-
\( \mathrm{P} \)
(1) Conc. \( \mathrm{H}_{2} \mathrm{SO}_{4} \)
(2) Dil. \( \mathrm{H}_{2} \mathrm{SO}_{4} \)
W
(3) Conc. \( \mathrm{HNO}_{3} \)
(4) Dil. \( \mathrm{HNO}_{3} \)
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