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# Test: Rate Of Chemical Reaction

## 10 Questions MCQ Test Chemistry Class 12 | Test: Rate Of Chemical Reaction

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This mock test of Test: Rate Of Chemical Reaction for Class 12 helps you for every Class 12 entrance exam. This contains 10 Multiple Choice Questions for Class 12 Test: Rate Of Chemical Reaction (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Rate Of Chemical Reaction quiz give you a good mix of easy questions and tough questions. Class 12 students definitely take this Test: Rate Of Chemical Reaction exercise for a better result in the exam. You can find other Test: Rate Of Chemical Reaction extra questions, long questions & short questions for Class 12 on EduRev as well by searching above.
QUESTION: 1

### A foreign substance that increase the speed of a chemical reaction is called

Solution:

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.

QUESTION: 2

### . What will be the value of instantaneous rate of reaction from the graph? Solution:

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]).

QUESTION: 3

### The rate of a chemical reaction doubles for every 10°C rise of temperature. If the temperature is raised by 50°C, the rate of the reaction increases by about  [AIEEE 2011]

Solution:

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

QUESTION: 4

Chemical substances speeding up rate of chemical reaction is called as

Solution:
QUESTION: 5

Chemical substances speeding up the rate of chemical reaction is called as

Solution:
QUESTION: 6

The rate constant of  zero-order reactions has the unit

Solution: QUESTION: 7

For the reaction A + B → C+ D . The variation of the concentration of the products is given by curve Solution:

For the reaction, A+B⟶C+D, the  variation of the concentration of the products is given by the curve Y.
Initially, the product concentration is 0, then it gradually rises and reaches a maximum value. After that it remains constant.

This behavior is represented by the curve Y.

QUESTION: 8

The term  -dx/dt  in the rate expression refers to the:

Solution:
QUESTION: 9

Instantaneous reaction expresses

Solution:
QUESTION: 10

Identify A in the given diagram. Solution: