Question

Hotosynthesis can be represented by 6CO2(g)+6H2O(l)⇌C6H12O6(s)+6O2(g) Which of the following will be false when the photosynthesis reaction reaches equilibrium?
a.The rate of formation of O2 is equal to the rate of formation of CO2.
b.The concentration of O2 will begin decreasing.
c.The concentrations of CO2 and O2 will not change.
d.The concentrations of CO2 and O2 will be equal.

Answer 1

Answer: Option (b) and (d) are correct.

Explanation:

An equilibrium reaction is defined as the reaction in which rate of forward reaction equals rate of backward reaction.

A photosynthesis reaction is the reaction in which plants in the presence of sunlight, water, and carbon dioxide make their own food.  

• The amount of carbon dioxide consumed will be equal to the rate of formation of oxygen into the atmosphere.

Hence, the statement rate of formation of $O_{2}$ is equal to the rate of formation of $CO_{2}$ is true.

• Concentration of oxygen may remain constant but it will not decrease. Hence, the statement concentration of $O_{2}$ will begin decreasing, is false.

• As both oxygen and carbon dioxide are present in an equilibrium reaction, So, their concentration will not change.

        Hence, the statement concentrations of $CO_{2}$ and $O_{2}$ will not change, is true.

• Concentration of carbon dioxide and oxygen will also depend on the limiting reagent. So, it is not necessary that the concentrations of $CO_{2}$ and $O_{2}$ will be equal.

Some amount of carbon dioxide might escape out into the air.

Hence, the statement concentrations of $CO_{2}$ and $O_{2}$ will be equal, is false.