JEE Main 2024 · Chemistry · Qualitative and Practical Chemistry · easy

A salt gives an apple-green flame, a yellow precipitate with K2CrO4 in acetic acid, and a white precipitate with dilute H2SO4 that does not dissolve…

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A salt gives an apple-green flame, a yellow precipitate with

\mathrm{K_2CrO_4}

in acetic acid, and a white precipitate with dilute

\mathrm{H_2SO_4}

that does not dissolve in conc.

\mathrm{HNO_3}

. The cation present is

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Answer: (A) $\mathrm{Ba^{2+}}$

Apple-green flame is characteristic of

\mathrm{Ba^{2+}}

(Sr: crimson, Ca: brick-red;

\mathrm{Pb^{2+}}

gives a bluish-white flame).

\mathrm{BaCrO_4}

is a yellow precipitate insoluble in acetic acid, and

\mathrm{BaSO_4}

is a white precipitate insoluble even in conc.

\mathrm{HNO_3}

. All three observations fit

\mathrm{Ba^{2+}}

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