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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3mc150

Consider 0.1 mol of $Al X_{2} (SO X_{4}) X_{3}$ ( $Al = 27$ , $S = 32$ , $O = 16$ ) treated as fully ionised in solution. Which statements are correct?

AIt contains 0.5 mol of ions in total
BIt contains 0.3 mol of sulphate ions
CThe sample has a mass of 34.2 g
DIt contains 0.6 mol of oxygen atoms

Answer: A, B, C

M = 54 + 3(96) = 342; 0.1 mol weighs 34.2 g (true). Each formula unit has 12 O atoms, giving 1.2 mol O atoms, so 0.6 is false. Sulphate = 0.1 x 3 = 0.3 mol (true). Ions = 0.1 x (2 + 3) = 0.5 mol (true).

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