Collision Theory

Q. Plot the energy vs reaction coordinate diagram for a hypothetical reaction X-----> Y, the activation energy for the forward and backward reactions are 15 and 9 kJ/mol respectively. The potential energy of X is 10 kJ/mol. Also calculate the heat of reaction, potential energy of Y, threshold energy and nature of reaction (i.e., endothermic or exothermic).

Q. The reaction A $\to$ C has activation for the forward and the backward reaction as 25 kJ and 32 kJ respectively. The $\Delta$ H for the reaction is

1. 57 kJ
2. -57 kJ
3. 7 kJ
4. -7 kJ

Q. An exothermic chemical process occurs in two steps as follows:
(i) $A+B\to X$ (slow)
(ii) $X\to AB$ (fast)
The energy profile diagram that best suits this process is:

1. 
2. 
3. 
4. 

Q. Q7. Mention the type of intermolecular attractions that exists between non-polar molecules.

Q. difference between intermolecular and intramolecularredox reaction

Q.

Species that are formed in one step of reaction mechanism and used up in another step are called

1. catalysts

2. intermediates

3. inhibitors

4. activated complexes

Q. Chemical reactions with very high $E_a$ values are generally:

1. Very fast
2. Very slow
3. Moderately fast
4. Spontaneous

Q.

The total energy after an elastic collision

1. Remains constant

2. Decreases

3. Increases

4. First increase and then becomes constants

Q.

what do u mean by " all collisions between atoms and molecules are perfectly elastic." ?

Q. Reaction A + B $\to$ C + D + 38 kcal, has activation energy 20 kcal, Activation energy for reaction C + D $\to$ A + B is

1. 20 kcal
2. -20 kcal
3. 58 kcal
4. 18 kcal

Q. 2.24 l co2 gas at ntp find mass

Q.

In most cases, for a rise of 10K temperature, the rate constant is doubled or tripled. This is due to the reason that ?

1. Collision frequency increases by a factor 2 to 3

2. Fraction of molecules possessing threshold energy increases by a factor of 2 to 3

3. Activation energy is lowered by a factor of 2 to 3

4. None of these