Which of the following is not a result when a change to an equilibrium system is applied? increasing the rate of the forward reaction will cause a shift to the left. increasing the rate of the reverse reaction will cause a shift to the left. decreasing the rate of the forward reaction will cause a shift to the left. decreasing the rate of the reverse reaction will cause a shift to the right.

Increasing the rate of the reverse reaction will cause a shift to the left.

Explanation:

Any change in the equilibrium is studied on the basis of Le-Chatelier's principle.

This principle states that if there is any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.

For the given equation:

For the given options:

Option A: Increasing the rate of the forward reaction will cause a shift to the left.

If the rate of forward reaction is increased, so according to the Le-Chatelier's principle , the equilibrium will shift in the direction where decrease in forward reaction occurs. Hence, the equilibrium will shift in the left direction.

Option B: Increasing the rate of the reverse reaction will cause a shift to the left.

If the rate of reverse reaction is increased, so according to the Le-Chatelier's principle , the equilibrium will shift in the direction where decrease in reverse reaction occurs. Hence, the equilibrium will shift in the right direction.

Option C: Decreasing the rate of the forward reaction will cause a shift to the left

If the rate of forward reaction is decreased, so according to the Le-Chatelier's principle , the equilibrium will shift in the direction where increase in forward reaction occurs. Hence, the equilibrium will shift in the right direction.

Option D: Decreasing the rate of the reverse reaction will cause a shift to the right.

If the rate of reverse reaction is decreased, so according to the Le-Chatelier's principle , the equilibrium will shift in the direction where increase in reverse reaction occurs. Hence, the equilibrium will shift in the left direction.

From the above explanation, we can easily say that the correct answer is Option B.

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

i think   the answer is c hope i'm right