Rates of Reaction : MCQ3

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What is the characteristic of the catalyst in surface adsorption theory?

It can be either a solid, liquid, or gas

It is always a gas

It is always a liquid

It is always a solid (correct)

What is the effect of an increase in temperature of 10K on the number of collisions?

A small increase of 50% (correct)

A significant increase of 100%

No change

A decrease of 20%

What is the effect of catalytic poisons on the reaction rate?

They increase the reaction rate by blocking inactive sites

They increase the reaction rate by increasing the activation energy

They have no effect on the reaction rate

They decrease the reaction rate by blocking active sites (correct)

What is the relationship between concentration and rate of reaction?

Concentration is directly proportional to rate Signup and view all the answers

What is the graphical method to determine the instantaneous rate of reaction?

By drawing a tangent to the curve at the point Signup and view all the answers

What is the characteristic of the reaction if ∆H is negative?

Exothermic reaction Signup and view all the answers

What is the effect of increasing the surface area of the catalyst?

It increases the reaction rate due to more available catalytic sites Signup and view all the answers

What is the term used to describe the accumulation of one substance at the surface of another?

Adsorption Signup and view all the answers

What is the primary function of manganese dioxide in the decomposition of hydrogen peroxide?

To act as a catalyst to speed up the reaction Signup and view all the answers

What is the term for the minimum energy required for colliding particles to result in a reaction?

Activation energy Signup and view all the answers

Which of the following is an example of heterogeneous catalysis?

Manganese dioxide in the decomposition of hydrogen peroxide Signup and view all the answers

What is the rate of reaction measured in terms of?

Change in concentration of products over time Signup and view all the answers

What is the term for a product of a reaction that becomes a catalyst for the same reaction?

Autocatalysis Signup and view all the answers

Which of the following is NOT a factor affecting the rate of reaction?

Color of the reactants Signup and view all the answers

What is the term for the theory that involves homogeneous catalysis?

Intermediate formation theory Signup and view all the answers

What is the definition of a catalyst?

A substance that alters the rate of a chemical reaction, but is chemically unchanged at the end of the reaction Signup and view all the answers

What is the term for a collision that results in a reaction?

Effective collision Signup and view all the answers

Rates of Reaction : MCQ3

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