29. Bleaching powder contains a salt of an oxoacid as one of its components. The anhydride of that oxoacid is\\
(A) $\mathrm { Cl } _ { 2 } \mathrm { O }$\\
(B) $\mathrm { Cl } _ { 2 } \mathrm { O } _ { 7 }$\\
(C) $\mathrm { ClO } _ { 2 }$\\
(D) $\mathrm { Cl } _ { 2 } \mathrm { O } _ { 6 }$

\section*{ANSWER : A}
\begin{enumerate}
  \setcounter{enumi}{29}
  \item 25 mL of household bleach solution was mixed with 30 mL of 0.50 M KI and 10 mL of 4 N acetic acid. In the titration of the liberated iodine, 48 mL of $0.25 \mathrm {~N} \mathrm { Na } _ { 2 } \mathrm {~S} _ { 2 } \mathrm { O } _ { 3 }$ was used to reach the end point. The molarity of the household bleach solution is\\
(A) 0.48 M\\
(B) 0.96 M\\
(C) 0.24 M\\
(D) 0.024 M
\end{enumerate}

\section*{ANSWER : C}
\section*{Paragraph for Questions 31 and 32}
The electrochemical cell shown below is a concentration cell.\\
$\mathrm { M } \mid \mathrm { M } ^ { 2 + }$ (saturated solution of a sparingly soluble salt, $\left. \mathrm { MX } _ { 2 } \right) \left| \left| \mathrm { M } ^ { 2 + } \left( 0.001 \mathrm {~mol} \mathrm { dm } ^ { - 3 } \right) \right| \mathrm { M } \right.$ The emf of the cell depends on the difference in concentrations of $\mathrm { M } ^ { 2 + }$ ions at the two electrodes. The emf of the cell at 298 K is 0.059 V .\\