
Concept explainers
Interpretation:
The correct representation of a reaction under
Concept introduction:
A chemical equilibrium is defined as a state of a
A reversible reaction is defined as a reaction where the reactants convert into products over time. The products formed react among themselves to give back the reactants. The conversion of the reactants to the products is the forward reaction while the re-conversion of the products to the reactants is the reverse reaction. The forwards and the reverse reactions are in chemical equilibrium with each other.

Answer to Problem 6STP
Option (B) is the correct answer.
Explanation of Solution
Reason for Correct Option:
CO2 binds with hemoglobin, Hb in blood in a reversible manner to form [CO2: hemoglobin]. Since the reaction is reversible, hence, there must be two components to this reversible reaction − the forward reaction and the reverse reaction.
The forward reaction is the binding of CO2 to hemoglobin to form [CO2: hemoglobin] while the reverse reaction is the breakdown of [CO2: hemoglobin] to CO2 and hemoglobin. Since in a chemical equilibrium, the forward arrow points from the reactants to the products and the reverse arrow points in the opposite direction, option (B) is the correct representation.
Reasons for Incorrect Options:
The first option, (A) and (D) are incorrect because the question deals with the reversible binding of CO2 with hemoglobin to form [CO2: hemoglobin] and thus, the forward reaction must represent this combination. However, here, the breakdown reaction is the forward reaction which is off course, wrong as per the question.
The third option, (C) is incorrect because the reaction is irreversible, i.e, the breakdown of [CO2: hemoglobin] to CO2 and hemoglobin doesn’t occur which is incorrect.
Chapter U6 Solutions
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