9th Class Chemistry Chapter 5 Online Test: 25 MCQs with Answers

By /

This 9th class chemistry chapter 5 online test covers Chapter 5 of the Class 9 Chemistry course, Energetics. It has 25 multiple-choice questions, shown one at a time, and it marks itself the moment you finish. There is no timer and no sign-up. When you press finish you get your score, and every question is shown again with your answer, the correct option and a short explanation of why that option is right. An Urdu medium version of the same test is further down this page.

What the 25 Questions Test

The questions are spread across the whole of Chapter 5 rather than one section, and most of them ask you to apply something rather than simply recall it. Expect to be doing the following:

  • Deciding whether a described reaction is exothermic or endothermic.
  • Matching the sign of the enthalpy change to the direction of heat flow.
  • Reading an energy level diagram and identifying activation energy on it.
  • Saying what a catalyst does and, just as importantly, what it does not do.
  • Distinguishing heat of formation, combustion and neutralisation.
  • Deciding whether a step absorbs or releases energy when bonds break or form.

Quick Recall Before You Start

These are the points Energetics questions turn on most often. Read them once, then begin:

  • Exothermic means heat out and a negative enthalpy change; endothermic is the reverse.
  • Breaking bonds costs energy; making bonds releases it.
  • A catalyst lowers activation energy and leaves the enthalpy change untouched.
  • Heat of neutralisation refers specifically to acid reacting with base to give water.

Traps Hidden in the Wrong Options

In a well-built multiple-choice test the wrong answers are not random; each one is placed there because students genuinely believe it. In this chapter look out for:

  • A positive enthalpy change attached to an exothermic reaction.
  • A catalyst described as changing the overall energy released.
  • Bond breaking described as releasing energy.

How the Test Works

  • 25 questions, one at a time, with Next and Previous buttons.
  • No timer, so you can work a calculation out on paper first.
  • Automatic marking as soon as you finish.
  • Answer review showing the correct option and an explanation for every question.
  • Retake as often as you like; your score is not stored anywhere.

Start the Chapter 5 Online Test

Chapter 5 turns on signs. Decide first whether heat goes in or out, and the sign of the enthalpy change follows. Read each question to the end before looking at the options, because one word such as “only”, “always” or “molten” can decide which answer is correct. Aim for 20 out of 25 or better before moving on.

/25

Class 9 Chemistry Chapter 5 Online Test — Energetics (English Medium)

1 / 25

Which of the following reactions has the least value of activation energy?

2 / 25

Formation of which hydrogen halide from the elements is an endothermic reaction?

3 / 25

What does it show when a chemical reaction is exothermic?

4 / 25

When NaOH and HCl are mixed the temperature increases. The reaction is:

5 / 25

The average bond energies for O–O and O=O are 146 and 496 kJ mol⁻¹ respectively. Find the enthalpy in kJ for the following reaction: H–O–O–H(g) → H–O–H(g) + ½ O=O(g)

6 / 25

Why does the following exothermic reaction not occur? C (Diamond) → C (Graphite), ΔH = −3 kJ mol⁻¹

7 / 25

Enthalpy (H) or heat content is defined as:

8 / 25

Which statement correctly distinguishes enthalpy from heat?

9 / 25

When water is boiled in a beaker, which of the following is the system?

10 / 25

When energy is transferred from the system to the surroundings, the change is called:

11 / 25

For 2CO(g) + O₂(g) → 2CO₂(g), ΔH° = −566.0 kJ. This reaction is:

12 / 25

The reaction 2H₂(g) + O₂(g) → 2H₂O(l) has ΔH = −571.6 kJ. When water decomposes back into hydrogen and oxygen, 571.6 kJ of heat is:

13 / 25

In the formation of NO in air by lightning, N₂(g) + O₂(g) → 2NO(g) − 180.6 kJ, the enthalpy change ΔH is:

14 / 25

Which statement about bonds in a chemical reaction is correct?

15 / 25

The bond dissociation energies of H₂ and O₂ are 435 kJ/mol and 498 kJ/mol. How much energy is absorbed to break the bonds of 2 mol H₂ and 1 mol O₂?

16 / 25

The energy evolved when O–H bonds form is 484 kJ/mol. How much energy is evolved in forming 4 mol of O–H bonds (2 mol of H₂O)?

17 / 25

Collisions between which molecules can produce the transition state?

18 / 25

The energy needed by the reactant particles to change into the transition state is called:

19 / 25

A reaction is exothermic if:

20 / 25

How does a catalyst increase the rate of a reaction?

21 / 25

Which catalyst is used in the hydrogenation of oil to give banaspati ghee?

22 / 25

During glycolysis, one molecule of glucose is split into two molecules of:

23 / 25

In anaerobic respiration (for example in yeast), glucose is converted into:

24 / 25

Glycogen, the primary storage form of glucose, is stored in the:

25 / 25

Which group of organic compounds, including fats, waxes and sterols, serves as an energy reserve in our body?

Your score is

0%

Chapter 5 Online Test — Urdu Medium

Urdu medium students can attempt the same Chapter 5 test with every question, option and explanation written in Urdu. It behaves exactly like the English test above: 25 questions one at a time, no timer, and a full answer review at the end.

/25

Class 9 Chemistry Chapter 5 Online Test — Energetics (Urdu Medium)

1 / 25

ذیل میں درج ری ایکشنز میں سے کس ری ایکشن کی ایکٹیویشن انرجی سب سے کم ہوگی؟

2 / 25

کون سا ہائیڈروجن ہیلائیڈ اینڈوتھرمک ری ایکشن کے نتیجے میں بنتا ہے؟

3 / 25

جب کوئی کیمیائی ری ایکشن ایکسوتھرمک ہو تو ری ایکشن کے بارے میں یہ ہمیں کیا بتاتا ہے؟

4 / 25

جب سوڈیم ہائیڈروآکسائیڈ کو ہائیڈروکلورک ایسڈ سے ملایا جاتا ہے تو سسٹم کا درجہ حرارت بڑھ جاتا ہے۔ اس کا مطلب ہے کہ یہ ری ایکشن:

5 / 25

O–O اور O=O بانڈز توڑنے کی انرجیز بالترتیب 146 kJ mol⁻¹ اور 496 kJ mol⁻¹ ہیں۔ ذیل میں درج ری ایکشن کی اینتھالپی میں تبدیلی kJ میں نکالیں: H–O–O–H(g) → H–O–H(g) + ½ O=O(g)

6 / 25

ذیل میں دیا گیا ایکسوتھرمک ری ایکشن کیوں وقوع پذیر نہیں ہوتا؟ C (ڈائمنڈ) → C (گریفائیٹ)، ΔH = −3 kJ mol⁻¹

7 / 25

اینتھالپی (Enthalpy) یا ہیٹ کنٹینٹ (Heat content) کسے کہتے ہیں؟

8 / 25

اینتھالپی اور ہیٹ کے فرق کے بارے میں کون سا بیان درست ہے؟

9 / 25

اگر آپ ایک بیکر میں پانی ابال رہے ہوں تو سسٹم کیا ہے؟

10 / 25

جب انرجی کا تبادلہ سسٹم سے سراؤنڈنگ کی طرف ہو تو اس تبدیلی کو کیا کہتے ہیں؟

11 / 25

ری ایکشن 2CO(g) + O₂(g) → 2CO₂(g) کے لیے ΔH° = −566.0 kJ ہے۔ یہ ری ایکشن ہے:

12 / 25

ری ایکشن 2H₂(g) + O₂(g) → 2H₂O(l) کی ΔH = −571.6 kJ ہے۔ اگر یہ ری ایکشن مخالف سمت میں چلے یعنی پانی ٹوٹ کر ہائیڈروجن اور آکسیجن گیس بنائے تو 571.6 kJ حرارت:

13 / 25

بادلوں میں بجلی چمکنے سے نائٹرک آکسائیڈ بنتی ہے: N₂(g) + O₂(g) → 2NO(g) − 180.6 kJ۔ اس ری ایکشن کی اینتھالپی چینج ΔH ہے:

14 / 25

کیمیائی ری ایکشن کے دوران بانڈز کے بارے میں کون سا بیان درست ہے؟

15 / 25

H₂ اور O₂ کے بانڈ توڑنے کی انرجی بالترتیب 435 kJ/mol اور 498 kJ/mol ہے۔ 2 مول H₂ اور 1 مول O₂ کے بانڈ ٹوٹنے سے کل کتنی انرجی جذب ہوگی؟

16 / 25

O–H بانڈ بننے پر 484 kJ/mol انرجی خارج ہوتی ہے۔ 4 مول O–H بانڈز بنانے (دو مول پانی) کے لیے کتنی انرجی خارج ہوگی؟

17 / 25

کن مالیکیولز کے آپس میں ٹکرانے سے ٹرانزیشن سٹیٹ بن سکتی ہے؟

18 / 25

ری ایکٹنٹس کے ایٹمز یا مالیکیولز کو ٹرانزیشن سٹیٹ میں تبدیل ہونے کے لیے جو انرجی درکار ہوتی ہے اسے کیا کہتے ہیں؟

19 / 25

کوئی ری ایکشن ایکسوتھرمک ہوتا ہے اگر:

20 / 25

کیٹالسٹ ری ایکشن کی رفتار کیسے بڑھاتا ہے؟

21 / 25

مائع خوردنی تیل کی ہائیڈروجنیشن سے بناسپتی گھی بنانے میں کون سا کیٹالسٹ استعمال ہوتا ہے؟

22 / 25

گلائی کولیسز کے دوران گلوکوز کا ایک مالیکیول کس کے دو مالیکیولز میں تبدیل ہوتا ہے؟

23 / 25

این ایروبک ریسپائریشن میں (مثلاً یسٹ میں) گلوکوز کس میں تبدیل ہوتا ہے؟

24 / 25

گلوکوز کی بنیادی ذخیرہ شکل گلائیکوجن (Glycogen) ہمارے جسم میں کہاں محفوظ ہوتی ہے؟

25 / 25

آرگینک کمپاؤنڈز کا وہ گروپ کون سا ہے جس میں چربی دار اشیا، موم اور سٹیرولز شامل ہیں اور جو جسم میں توانائی کے ذخیرہ کا کام دیتا ہے؟

Your score is

0%

What to Do With Your Score

The score matters less than the review that follows it. Note the topic behind each wrong answer rather than the question number, and if several come from one part of the chapter, revise that part alone. For Chapter 5 the part worth securing first is energy level diagrams, which carry marks in the written paper as well. Retake the test a day or two later rather than straight away, then move to the written paper, where you have to produce the answer instead of recognising it.

Frequently Asked Questions

How do I tell an exothermic reaction from an endothermic one in a question?

Look for where the heat goes. If the surroundings get warmer, or the enthalpy change is negative, it is exothermic. If the container feels cold, or the value is positive, it is endothermic.

Does a catalyst change how much energy a reaction gives out?

No. A catalyst only lowers the activation energy, so the reaction gets going more easily. The overall enthalpy change is exactly the same with or without it.

Is this test free?

Yes. There is no sign-up, no limit on retakes and nothing is locked. Your score is not saved or shared.

Related Class 9 Chemistry Resources

Once the MCQs feel comfortable, move to writing. The Chapter 5 test paper is a 36-mark bilingual practice paper with an MCQ answer key, and the Chapter 5 solved notes give you the solved exercise for the same chapter. Carry on with Chapter 4 online test (Stoichiometry) and Chapter 6 online test (Equilibria). Browse every Class 9 Chemistry online test, all Class 9 Chemistry test papers and the Class 9 Chemistry notes, or open the Class 9 Chemistry page for everything in one place.

Other subjects: Physics, Biology and Maths chapter tests, Physics, Maths and Biology guess papers, or the Class 9 hub.

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top