Chemistry · Practical Inorganic chemistry (Qualitative Analysis)

JEE Main 2026 — 2 April, Morning Shift — Question 56

A salt with few drops of conc. HCl gives apple green colour in flame test. The group precipitate of the salt is dissolved in acetic acid and treated with $\mathrm{K}_{2} \mathrm{CrO}_{4}$ to give yellow precipitate. When the sodium carbonate extract of the salt solution is heated with conc. $\mathrm{HNO}_{3}$ and ammonium molybdate, it resulted a canary yellow precipitate. The cation and anion present in the salt are respectively.

Option A:
$\mathrm{Ca}^{2+}$ and $\mathrm{SO}_{4}^{2-}$
Option B:
$\mathrm{Ba}^{2+}$ and $\mathrm{PO}_{4}^{3-}$
Correct
Option C:
$\mathrm{Mn}^{2+}$ and $\mathrm{PO}_{4}^{3-}$
Option D:
$\mathrm{Ba}^{2+}$ and $\mathrm{SO}_{4}^{2-}$

Answer: B

Step-by-step solution

Sol. (i) $\mathrm{Ba}^{+2}$ gives apple green colour while $\mathrm{Ca}^{+2}$ and $\mathrm{Sr}^{+2}$ gives brick red and crimson red in flame test. (ii) $\mathrm{Ba}^{+2}+\mathrm{CrO}_{4}^{2-} \rightarrow \underset{\text { Yellow ppt }}{\mathrm{BaCrO}_{4}}$

Answer key and solution verified before publishing.

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Exam: JEE Main 2026
Paper: 2 April, Morning Shift
Subject: Chemistry
Chapter: Practical Inorganic chemistry (Qualitative Analysis)
Topic: Identification of Cations (Groups 1 to 3)