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Assertion (A): For questions below, two statements are given one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes \( (a),(b),(c) \) and \( (d) \) given below :
(a) Both A and R are correct and \( \mathrm{R} \) is the correct explanation of \( \mathrm{A} \).
(b) Both \( \mathrm{A} \) and \( \mathrm{R} \) are correct but \( \mathrm{R} \) is not the correct explanation of \( \mathrm{A} \).
(c) A is correct but \( \mathrm{R} \) is wrong.
(d) A is wrong but \( \mathrm{R} \) is correct.
Assertion. Sulphur is estimated as \( \mathrm{BaSO}_{4} \) and not as \( \mathrm{MgSO}_{4} \).
Reason (R): Reason. The ionic radius of \( \mathrm{Mg}^{2+} \) is smaller than that of \( \mathrm{Ba}^{2+} \).
(A) Both A and R are true and R is the correct explanation of A.br(B) Both A and R are true, but R is not the correct explanation of A.
(C) A is true, but R is false.
(D) A is false, but R is true.
(E) Both A and R are false.
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