JEE Main · 2026 · 02 Apr 2026 · Shift 1 · Practical and Analytical Chemistry

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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

K_{2} CrO_{4}

to give yellow precipitate. When the sodium carbonate extract of the salt solution is heated with conc.

HNO_{3}

and ammonium molybdate, it resulted a canary yellow precipitate. The cation and anion present in the salt are respectively.

(A) $Ca^{2 +}$ and $SO_{4}^{2 -}$
(B) $Ba^{2 +}$ and $PO_{4}^{3 -}$ ✓ Correct
(C) $Mn^{2 +}$ and $PO_{4}^{3 -}$
(D) $Ba^{2 +}$ and $SO_{4}^{2 -}$

Answer: (B)

Solution

An apple-green flame identifies

B a^{2 +}

. In acetic acid the barium ion gives a yellow precipitate of

BaCr O_{4}

with

K_{2} Cr O_{4}

. Heating the sodium carbonate extract with concentrated

HN O_{3}

and ammonium molybdate yields the canary-yellow ammonium phosphomolybdate, confirming phosphate. The salt therefore contains

B a^{2 +}

and

P O_{4}^{3 -}

JEE Main · 2026 · 02 Apr 2026 · Shift 1 · Single correct option

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JEE Main · 2026 · 02 Apr 2026 · Shift 1 · Practical and Analytical Chemistry

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