Factors Affecting Rate of Reaction

Q.

Which of the following does NOT affect the rate of a chemical reaction?

1. enthalpy of the reaction

2. concentration of reactants

3. temperature

4. surface area

Q. $A\left(g\right)\to 2B\left(g\right)+C\left(g\right)$
Initially at t = 0 gas A was present along with some amount of gas C. At At t = 0, the mole fraction of gas C is $\frac{1}{3}$. After some time $t=t_1$, the total pressure is half of the final total pressure at $t=t_x$ (a very long time). Assume this decomposition to follow first order kinetics (at a constant temperature). It is also given at $t=t_x$, the final total pressure is 35 bar.

Rate constant $\left(k\right)=(\log 64-\log 49)s^{-1}$. Value of $t_1$ in seconds is:

1. 2.15 s
2. 1.5 s
3. 2.3 s
4. 1.15 s

Q. $A\left(g\right)\to 2B\left(g\right)+C\left(g\right)$
Initially at t = 0 gas A was present along with some amount of gas C. At At t = 0, the mole fraction of gas C is $\frac{1}{3}$. After some time $t=t_1$, the total pressure is half of the final total pressure at $t=t_x$ (a very long time). Assume this decomposition to follow first order kinetics (at a constant temperature). It is also given at $t=t_x$, the final total pressure is 35 bar.

At $t=t_1$ pressure of gas B is.

1. 1.25 bar
2. 5.0 bar
3. Data is insufficient
4. 2.5 bar

Q. $A\left(g\right)\to 2B\left(g\right)+C\left(g\right)$
Initially at t = 0 gas A was present along with some amount of gas C. At At t = 0, the mole fraction of gas C is $\frac{1}{3}$. After some time $t=t_1$, the total pressure is half of the final total pressure at $t=t_x$ (a very long time). Assume this decomposition to follow first order kinetics (at a constant temperature). It is also given at $t=t_x$, the final total pressure is 35 bar.

Ratio of rate constant at t = 0 to $t=t_1$ to $t=t_x$ is:

1. 2 : 3 : 4
2. 1 : 3 : 5
3. 1 : 3 : 5
4. 1 : 1 : 1

Q. As temperature increases, the rate of reaction

1. decreases and increases
2. decreases
3. increases
4. stays the same

Q. $A\left(g\right)\to 2B\left(g\right)+C\left(g\right)$
Initially at t = 0 gas A was present along with some amount of gas C. At At t = 0, the mole fraction of gas C is $\frac{1}{3}$. After some time $t=t_1$, the total pressure is half of the final total pressure at $t=t_x$ (a very long time). Assume this decomposition to follow first order kinetics (at a constant temperature). It is also given at $t=t_x$, the final total pressure is 35 bar.

Ratio of rate constant at t = 0 to $t=t_1$ to $t=t_x$ is:

1. 2 : 3 : 4
2. 1 : 1 : 1
3. 1 : 3 : 5
4. 1 : 3 : 5

Q. For a reaction $2N_2{O}_5\left(g\right)$$\to 4N{O}_2\left(g\right)+O_2\left(g\right)$ , the rate and rate constant are $1.02\times {10}^{-4}$ $mol{L}^{-1}{s}^{-1}$ and $3.4\times {10}^{-5}{s}^{-1}$ respectively. The concentration of $N_2{O}_5$ at this time will be:

1. 1.732 mol/L
2. $1.02\times {10}^{-4}$ mol/L
3. 3 mol/L
4. $3.2\times {10}^5$ mol/L

Q.

Reaction rates can change with

1. temperature

2. the addition of a catalyst

3. reactant concentrations

4. all of these

Q.

Lanny tried to make cake by mixing the following ingredients in a dark room.

1. Eggs

2. Butter

3. Flour

4. A catalyst-baking powder.

Assuming they undergo a violent reaction to form cake, which of the following may affect the rate of the reaction.

1. A dragon breathing flames on the vessel.

2. Concentration of the eggs

3. Amount of flour
4. Performing it in a sunny beach.

Q. For the reaction :
$2N_2{O}_5\to 4N{O}_2+O_2$
Rate and rate constant $1.02\times {10}^{-4}$ and $3.4\times {10}^{-5}{s}^{-1}$ respectively, then concentration of $N_2{O}_5$ at that time will be

1. $1.732$
2. $3$
3. $1.02\times {10}^{-4}$
4. $3.4\times {10}^5$

Q. For a reaction $2N_2{O}_5\left(g\right)$$\to 4N{O}_2\left(g\right)+O_2\left(g\right)$ , the rate and rate constant are $1.02\times {10}^{-4}$ $mol{L}^{-1}{s}^{-1}$ and $3.4\times {10}^{-5}{s}^{-1}$ respectively. The concentration of $N_2{O}_5$ at this time will be:

1. 1.732 mol/L
2. 3 mol/L
3. $1.02\times {10}^{-4}$ mol/L
4. $3.2\times {10}^5$ mol/L

Q. The rate at which a substance reacts depends upon:

1. Atomic weight
2. Atomic number
3. Molecular weight
4. Active mass

Q. The scientist "Q" was experimenting to revive a giant called the Mountain. He accidentally dropped a vial of ammonia on the ground. He saw ammonia react with oxygen and produce NO and water.

Let's say the rate of formation of NO is 3.6 x 10^-3 $M{s}^{-1}$

Calculate

• The rate of disappearance of ammonia
• Rate of formation of water

1. 3.6 x 10^-3 $M{s}^{-1}$ and 3.6 x 10^-3 $M{s}^{-1}$
2. 9 x 10^-3 $M{s}^{-1}$ and 5.4 x 10^-3 $M{s}^{-1}$
3. 7.2 x 10^-3 $M{s}^{-1}$ and 3.6 x 10^-3 $M{s}^{-1}$
4. 3.6 x 10^-3 $M{s}^{-1}$ and 5.4 x 10^-3 $M{s}^{-1}$