11. The reason(s) why carbon dioxide represents the most oxidized form of carbon

Question

11. The reason(s) why carbon dioxide represents the most oxidized form of carbon is

A) the electronegative carbon draws electrons towards itself from the 2 double-bonded oxygen atoms making the carbon more oxidized

B) the 2 electronegative oxygens draw electrons towards themselves making the carbon more oxidized

C) because carbon dioxide serves as the final electron acceptor in cellular respiration

D) both statements B and C

12. Standard free energy change values (DG’0) are

A) always positive for favorable reactions

B) useful when comparing the relative “favorable” or “unfavorable” thermodynamics of different steps/reactions in a particular pathway   ??????

C) useful when you want to know the exact thermodynamic properties of a chemical reaction in a living cell

D) altered by enzymes

E) completely useless, I don’t know why we have to learn about them in class!

Please explain?

Explanation / Answer

11- In case of CO2, Carbon is electropositive atom and oxygen is the electro-negative atom.

So option A is wrong

Both the oxygen present in the CO2 draws electron themselves from the centrally placed carbon atom

In case of cellular respiration, O2 is the final electron acceptor, not CO2. So option C is wrong

So correct answer is option B.

12- For favourable reaction DG'O value is negative So option A is wrong

B) Option B is correct. DG'O helps us to find the favourable and unfavourable reaction in the biochemical pathway. For favourable reaction DG'O value is negative and for unfavourable reaction DG'O value is positive.

C) Option C is also correct. DG'O value gives us the idea that the reaction is favourable or not favourable in the living cells.

D- Option is also correct. Enzyme alters the rate of reaction by lower the DG'O value for the reaction.

So correct answers are options A, B, C and D

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