Question

How many statements are correct:

1. If there is no relation between rate constant and temperature, then activation energy is negative.
2. If the activation energy is zero, rate constant is temperature independent.
3. If rate constant increases with increase of temperature, activation energy is positive.
4. If rate constant decreases with increase in temperature, activation energy is negative.

• A. 1 and 2
• B. 2 and 3
• C. 2, 3, and 4
• D. 4

Answer 1

Answer: (C)

2, 3, and 4

Answer 2

The correct option is (C): 2, 3, and 4
k = Ae-Ea/RT
$ln k = In A - \frac{E_a}{RT}$
Clearly,

if Ea = 0, k is temperature independent
if Ea > 0, k increases with increase in temperature
if Ea < 0, k decreases with increase in temperature
Therefore, 2, 3, and 4 is the right option.