Question

Assertion :${S{O}_4}^{2-}$ is estimated as $BaS{O}_4$ but not as $MgS{O}_4$ Reason: Ionic radius of $M{g}^{2+}$ is smaller than that of $B{a}^{2+}$

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

$S{O_4}^{-2}$ is estimated as $BaS{O}_4$ as $BaS{O}_4$ is completely insoluble whereas $MgS{O}_4$ is not completely insoluble but is fairly soluble. Estimating $S{O_4}^{-2}$ as $MgS{O}_4$ will not give correct result.

Hence, it is correct that ionic radii of $M{g}^{+2}$is smaller than that of $B{a}^{+2}$ but it is not the correct explanation of the assertion.