$0.1 M \quad\quad 0.2 M \quad0.1 M$

$BaSO _4 \rightleftharpoons Ba ^{+2}+ SO _4{ }^{2-}$

$a - S \quad S \quad S +0.1 \approx 0.1$

$K _{ SP }= S \times 10^{-1}$

$\Rightarrow 1 \times 10^{-10}= S \times 10^{-1}$

$\Rightarrow S =10^{-9} mol L^{-1 }$

So, $S =10^{-9} \times 233\,g\,L ^{-1}$

So, Answer : $233$