Net yield of $ATP$ molecules in aerobic respiration during Krebs' cycle per glucose molecule is

The citric acid cycle begins with the reaction . . . . . . .

Two molecules of acetyl CoA form . . . . . . after entering the Krebs cycle.

In the following reaction,identify $X$ and $Y$ respectively.
$\text{Pyruvic acid} + \text{CoA} + \text{NAD}^+ \xrightarrow[X]{\text{Mg}^{2+}} Y + \text{CO}_2 + \text{NADH} + \text{H}^+$

All enzymes of the $TCA$ cycle are located in the mitochondrial matrix, except for one which is located in the inner mitochondrial membrane in eukaryotes and in the cytosol in prokaryotes. This enzyme is

Where does the following reaction take place?
$Pyruvic \text{ } acid + 4NAD^+ + FAD^+ + 2H_2O + ADP + \Pi \rightarrow 3CO_2 + 4NADH + 4H^+ + FADH_2 + ATP$