Which of the following is produced during Kreb's cycle?

In a single Krebs cycle,decarboxylation takes place at how many steps?

Oxalosuccinic acid,an intermediary compound of the Krebs' cycle,is a:

The activation of the enzyme aconitase in the $TCA$ cycle requires .........

Identify the location of the enzyme for the given reaction in the Krebs cycle:
Succinic acid $+ FAD \rightarrow$ Fumaric acid $+ FADH_2$

In the $Krebs$ cycle,$FAD$ acts as an electron acceptor during the conversion of which of the following?