Characteristics of Chemical Equilibrium

Q.

A hypothetical reaction ${\mathrm{A}}_2+{\mathrm{B}}_2\to 2\mathrm{AB}$ follows the mechanism as given below: ${\mathrm{A}}_2\rightleftharpoons \mathrm{A}+\mathrm{A}\left(\mathrm{fast}\right)\mathrm{A}+{\mathrm{B}}_2\to \mathrm{AB}+\mathrm{B}\left(\mathrm{slow}\right)\mathrm{A}+\mathrm{B}\to \mathrm{AB}\left(\mathrm{fast}\right)$The order of the overall reaction is:

1. $2$

2. $1$

3. $1.5$

4. $0$

Q.

For a reaction, the reaction quotient, Qc > Kc, then the reaction

1. is at equilibrium.

2. is exothermic.

3. will shift to right.

4. will shift to left.

Q. 20. A mixture of three gases, A (density = 0.91), B (density = 0.52) and C (density = 0.72) is enclosed in a vessel at constant temperature when equilibrium is established. The observation which is most likely to occur is Gas A will be at the top in the vessel Gas B will be at the top in the vessel Gas c will be at the top in the vessel The gases will mix homogenously throughout the vessel

Q. In the chemical reaction $A\rightleftharpoons B$, the system is said to be in equilibrium when:

1. $A$ completely changes to $B$
2. $50\%$ of $A$ changes to $B$
3. The rate of change of $A$ to $B$ and $B$ to $A$ are same
4. Only $10\%$ of $A$ changes to $B$

Q. Write the integrated rate equation for pseudo first order reaction

Q. Thermodynamics is not concerned about _______.

1. The extent to which a chemical reaction proceeds.
2. The rate at which a reaction proceeds.
3. Energy changes involved in a chemical reaction.
4. The feasibility of a chemical reaction.

Q.

Which of the following graphs are correct for the given reactions; $H_2\left(g\right)+C{O}_2\left(g\right)\rightleftharpoons H_{2}O\left(g\right)+CO\left(g\right)$ Assume initially only $H_2$ and $C{O}_2$ are present :

1. 

2. 

3. 

4. 

Q. Which of the following is not a general characteristic of equilibrium involving physical processes?

1. Equilibrium is possible only in a closed system at a given temperature
2. All measurable properties of the system remain constant
3. All the physical processes stop at equilibrium
4. The opposing processes occur at the same rate and there is a dynamic but a stable condition

Q. Statement 1: For a chemical reaction at initial stage rate of forward reaction $\left(r_f\right)$ is greater than rate of reversed reaction $\left(r_b\right)$
Statement 2: When $r_f=r_b,$ chemical reaction is at equilibrium.

1. Statement 1 is true but statement 2 is wrong
2. Statement 2 is true but statement 1 is wrong
3. Both statement are true
4. None of above statement are true

Q. If $PC{l}_5$ is 80% dissociated at $523\text{K}$, what is the vapour density of the equilibrium mixture at $523\text{K}$ ?

1. 57.92
2. 67.92
3. 77.93
4. 45.45

Q. The equilibrium constant for the reaction is $H_2+B{r}_2\to 2HBr$ at 1024 k is $1.60\times {10}^5.$ Find the equilibrium pressure of all gases if $10bar$ of HBr is introduced into a sealed container at $1024K$.

1. $10bar$
2. $20bar$
3. $15bar$
4. $17bar$

Q. What is the nature of Chemical equilibrium ?

1. Static
2. Dynamic
3. Irreversible
4. Both b and c

Q. Which of the following is not a general characteristic of equilibrium involving physical processes?

Q. In the chemical reaction $A\rightleftharpoons B$, the system is said to be in equilibrium when:

1. $A$ completely changes to $B$
2. $50\%$ of $A$ changes to $B$
3. The rate of change of $A$ to $B$ and $B$ to $A$ are same
4. Only $10\%$ of $A$ changes to $B$