To identify the inorganic sulfides that are yellow in color, let's examine the given compounds:
From this information, the correct yellow sulfides are \(As_2S_3\) and \(As_2S_5\). Therefore, the appropriate answer is:
(D) and (E) only
Consider an A.P. $a_1,a_2,\ldots,a_n$; $a_1>0$. If $a_2-a_1=-\dfrac{3}{4}$, $a_n=\dfrac{1}{4}a_1$, and \[ \sum_{i=1}^{n} a_i=\frac{525}{2}, \] then $\sum_{i=1}^{17} a_i$ is equal to
