What are the different types of bonds formed by sulphur with oxygen in thiosulfuric acid?

Which of the following is not an alkali metal?

What is formula of mustard gas?

Rate law for the reaction $\mathrm{aA}+\mathrm{bB} \rightarrow \mathrm{cC}+\mathrm{dD}$ is $r=k[A][B]$, the rate of reaction doubles if