18. Reaction of $\mathrm { Br } _ { 2 }$ with $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 }$ in aqueous solution gives sodium bromide and sodium bromate with evolution of $\mathrm { CO } _ { 2 }$ gas. The number of sodium bromide molecules involved in the balanced chemical equation is
ANSWER : 5
The maximum number of electrons that can have principal quantum number, $n = 3$, and spin quantum number, $m _ { \mathrm { s } } = - 1 / 2$, is
ANSWER: 9
The differeance in the oxidation numbers of the two types of sulphur atoms in $\mathrm { Na } _ { 2 } \mathrm {~S} _ { 4 } \mathrm { O } _ { 6 }$ is
18. Reaction of $\mathrm { Br } _ { 2 }$ with $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 }$ in aqueous solution gives sodium bromide and sodium bromate with evolution of $\mathrm { CO } _ { 2 }$ gas. The number of sodium bromide molecules involved in the balanced chemical equation is
\section*{ANSWER : 5}
\begin{enumerate}
\setcounter{enumi}{18}
\item The maximum number of electrons that can have principal quantum number, $n = 3$, and spin quantum number, $m _ { \mathrm { s } } = - 1 / 2$, is
\end{enumerate}
ANSWER: 9\\