AP MCQ 07ABCDEFGHIJKLMN PART 2

Question 01:

Addition of an inert gas such as neon, to an equilibrium mixture of nitrogen, hydrogen and ammonia (shown below), will result in what change?

N₂ + 3H₂ ⇌ 2NH₃

A shift toward the prodcut side since adding neon increases the partial pressure of the reactants
A shift toward the prodcut side since adding neon increases the total pressure in the system
No change since the partial pressures of reactants and products do not change, and hence Q remains the same
No change since neon gas will be evenly distributed amongst the reactant and product side of the reaction

Question 02:

Which of the following changes will result in more CO_(g) being created in the equilibrium mixture?

H_2(g) + CO_2(g) ⇌ H₂O_(g) + CO_(g)

The addition of water vapor
A decrease in the size of the reaction vessel
Introducing a dehydrating reagent to the system
Addition of catalyst

Question 03:

In which of the following equilibrium systems will the mole fraction of products be increased, by the decreasing the total pressure on the system?

N_2(g) + 3H_2(g) ⇌ 2NH_3(g)
N₂O_4(g) ⇌ 2NO_2(g)
3O_2(g) ⇌ 2O_3(g)
H_2(g) + CO_2(g) ⇌ H₂O_(g) + CO_(g)

Question 04:

Dichromate(VI) ions (orange) can be converted to chromate(VI) ions (yellow) by adding water. The equilibrium below can be established. Which of the following is initially UNCHANGED by the addition of hydroxide ions to the equilibrium mixture?

Cr₂O₇^2-_(aq) + H₂O_(l) ⇌ 2CrO₄^2-_(aq) + 2H⁺_(aq)

The color of the solution
The concentration of H⁺ ions in solution
The concentration of dichromate(VI) ions in solution
The oxidation number of the Cr

Questions 05-06:

In the equilibrium shown below, Fe³⁺ is a yellow brown color, and the [FeSCN]²⁺ ion is blood red.

Fe³⁺ + SCN^- ⇌ [FeSCN]²⁺ ∆H = negative

Question 05:

If a reaction mixture is plunged into an ice-bath, what observation might one reasonably expect to make?

The reaction mixture turning a blood red color
The formation of SCN^- ions
The reaction mixture becoming increasingly yellow/brown in color
The formation of Fe³⁺ ions

Question 06:

Addition of hydroxide ions to the system will result in what, observable change?

The formation of a precipitate and no color change
The formation of a precipitate and a color change
A color change but no precipitate formed
No color change and no precipitate formed

Question 07:

Consider the equilibrium shown below.

3Cl_2(g) + 6OH^-_(aq) ⇌ 5Cl^-_(aq) + ClO₃^-_(aq) + 3H₂O_(l)

Assuming silver hydroxide to be soluble, addition of which of the following to the equilibrium mixture, will cause the equilibrium to shift to the product side?