What would happen to the concentrations of Pyruvate, NADH and intermembrane H+ if the ETC stopped working?

No effect on Pyruvate, NADH but has effect on intermembrane H+.

Explanation:

If the electron transport chain stopped working, the concentrations of Pyruvate and NADH are remain the same but intermembrane H+ because these Pyruvate and NADH molecules are formed in the process of glycolysis while the  intermembrane H+ occurs in the Krebs cycle. The electron transport chain starts their work in the second stage of Krebs cycle which occurs after glycolysis so in that way the electron transport chain has no effect on the concentrations of Pyruvate and NADH but has  effect intermembrane H+.

pyruvate and NADH stay the same, H+ decrease

Explanation:

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