Chemistry 2nd Paper MCQ-Cumilla Board-2023

1. What type of isomerism does

compound show?

2. What is the nature of the mixture of same volume of $0.1 ~\mathrm{MNaOH}$ and $\mathrm{H}_{2} \mathrm{SO}_{4}$ solutions?

3. In Reaction-

$\begin{array}{l} 2 \mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}(a q)+\mathrm{I}_{2} \rightarrow \mathrm{Na}_{2} \mathrm{~S}_{4} \mathrm{O}_{4}(a q)+ 2 \mathrm{NaI}(\mathrm{aq}) \end{array}$

i. $\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}$ is a secondary standard substance.

ii. $\mathrm{L}_{2}$ is reduced

iii. The oxidation number of ' $S$ ' is decreased

Which one is correct?

4. During electrolysis which ion will discharge first?

5. What is the Molar concentration of 5% $Na_2CO_3$ in Molar?