Reactions and Rate of Reaction MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Reactions and Rate of Reaction, a fundamental topic in the field of Chemistry. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Reactions and Rate of Reaction MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Reactions and Rate of Reaction mcq questions that explore various aspects of Reactions and Rate of Reaction problems. Each MCQ is crafted to challenge your understanding of Reactions and Rate of Reaction principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Chemistry tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Reactions and Rate of Reaction MCQs are your pathway to success in mastering this essential Chemistry topic.

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Reactions and Rate of Reaction MCQs | Page 12 of 35

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Q111.
Consider the reaction: Na(s) + O₂(g) → Na₂O. Moles of oxygen needed to balance the equation are

a.

1

b.

2

c.

3

d.

4

Discuss
Answer: (a).1
Q112.
Consider the reaction: Al(s) + O₂ (g) → Al₂O₃. Moles of Al(s) needed to balance the equation are

a.

1

b.

2

c.

3

d.

4

Discuss
Answer: (d).4
Q113.
Consider the reaction: P(s) + O₂(g) → P₄O₁₀(s). Moles of P(s) needed to balance the equation are

a.

1

b.

2

c.

3

d.

4

Discuss
Answer: (d).4
Q114.
Consider the reaction: Al(s) + O₂(g) → Al₂O₃. Moles of oxygen (O₂) needed to balance the equation will be

a.

1

b.

2

c.

3

d.

4

Discuss
Answer: (c).3
Q115.
Consider the reaction: S(s) + O₂(g) → SO₂. If oxidation is allowed to continue, the product formed is

a.

SO₂ (g)

b.

SO₃(g)

c.

S₂O₃(s)

d.

S₂O₄(aq)

Discuss
Answer: (b).SO₃(g)
Q116.
Use of catalyst in the reaction changes

a.

Entropy

b.

Enthalpy

c.

Internal energy

d.

Activation energy

Discuss
Answer: (d).Activation energy
Q117.
It is a short-lived species and decomposes into products immediately

a.

Activated complex

b.

Reactants

c.

Effective molecules

d.

All products

Discuss
Answer: (a).Activated complex
Q118.
The energy of activation of forwarding reaction is less than that of backward reaction in

a.

Endothermic reactions

b.

Exothermic reactions

c.

Isothermal reactions

d.

All reactions

Discuss
Answer: (b).Exothermic reactions
Q119.
Minimum amount of energy required to activate atoms, ions and molecules to undergo chemical reaction is called

a.

Kinetic energy

b.

Potential energy

c.

Activation energy

d.

Rotational energy

Discuss
Answer: (c).Activation energy
Q120.
By increasing temperature, the rate of chemical reaction increases. It is due to

a.

Greater number of molecules

b.

Greater number of collisions

c.

Greater velocity of molecules

d.

Lesser number of molecules

Discuss
Answer: (a).Greater number of molecules
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