Test: Determination of Rate of a Reaction, Arrhenius theory - JEE MCQ

Catalyst: Substances which alter  the rate of a chemical reaction and themselves remain chemically and quantitatively unchanged  after the reaction are known as catalysts and the phenomenon is known as catalysis.

If you make a graph of concentration of reactant vs time, the instantaneous reaction rate at a given time is the slope of the tangent line at that point in time. It is also the value of the rate law at a specific concentration (dA/dt is rate = k [A]).

For 2times=10°c.
for 4times=20°c.
for 6times=30°c.
for 8times=40°c.
and for 10times=50°c.

For every 10°C rise of temperature, the rate is doubled. Thus, the temperature coefficient of the reaction = 2

When temperature is increased by 50°, rate becomes =2^(50/10) = 2⁵ times = 32 times

A catalyst is a substance that can be added to a reaction to increase the reaction rate without getting consumed in the process. Catalysts typically speed up a reaction by reducing the activation energy or changing the reaction mechanism. Enzymes are proteins that act as catalysts in biochemical reactions.

Radioactive disintegration is first order reaction