Assertion (A): Group V carbonates are dissolved in acetic acid, and not in dilute H2SO4, before the chromate test for Ba^2+. Reason (R): Dilute H2SO4 would convert Ba^2+ and Sr^2+ (and partly Ca^2+) into their sparingly soluble sulphates, removing them from solution. Choose the correct option.

Both A and R are true and R is the correct explanation of A

Both A and R are true but R is not the correct explanation of A

Both A and R are true and R is the correct explanation of A

JEE Advanced levelSingle correct optionDifficulty 3 of 3qc146

Assertion (A): Group V carbonates are dissolved in acetic acid, and not in dilute $H X_{2} SO X_{4}$ , before the chromate test for $Ba X^{2 +}$ . Reason (R): Dilute $H X_{2} SO X_{4}$ would convert $Ba X^{2 +}$ and $Sr X^{2 +}$ (and partly $Ca X^{2 +}$ ) into their sparingly soluble sulphates, removing them from solution. Choose the correct option.

Carbonates dissolve in acetic acid with evolution of

CO X_{2}

and give soluble acetates, which can then be tested with chromate. Sulphuric acid would give

BaSO X_{4}

SrSO X_{4}

and some

CaSO X_{4}

precipitates, so the cations would not be available as free ions. R correctly explains A.