Concentration and Speed of Reaction

Q.

A flask contains a mixture of compounds $A$ and $B$. Both compounds decompose by first order kinetics. The half-lives for $A$ and $B$ are $300s$ and $180s$, respectively. If the concentrations of $A$ and $B$ are equal initially, the time required for the concentration of $A$ to be four times that of $B$ (in $s$) is: (Use $\ln 2=0.693$)

1. $180$

2. $300$

3. $120$

4. $900$

Q.

nt2 moles of ammonia is introduced in a evacuated 500 ml vessel at high temperatures the decomposition rxn. is 2NH3-N2+3H2at the equilibrium Nh3 becomes 1 mole then the k would be.n

Q. The formula for concentration of solution in terms of volume by volume percentage is:

1. $\frac{\text{volume of solvent}}{\text{volume of solute}}\times 100$
2. $\frac{\text{volume of solution}}{\text{volume of solute}}\times 100$
3. $\frac{\text{volume of solute}}{\text{volume of solution}}\times 100$
4. $\frac{\text{volume of solute}}{\text{volume of solvent}}\times 100$

Q. 80 ml of a solution contains 20 g of solute. What is the concentration of this solution in terms of mass by volume percentage of the solution?

1. 25

Q.

20 ml each of oxygen and hydrogen and 10 ml of carbon monoxide are exploded in an enclosure find volume and composition of the resulting mixture of the gases when they are cooled to room temperature?

Q. Analyze the diagram below:

The rate of the reaction will be maximum in

1. Test tube B
2. Test tube C
3. Test tube A
4. Test tube D

Q.

10 grams of silver chloride undergoes a decomposition reaction to form silver and chloride. What will be the rate of the reaction if 8 g of silver chloride has decomposed completely in two minutes?

1. 16 g min

2. 10 g min

3. 4 g/min

4. 6 g min