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EBSU CHM 101 CBT Practice

April 24, 2025

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Are you preparing for your upcoming CBT exams and want a solid way to test your knowledge and build confidence? We’ve got something exciting for you—CBT Practice Questions with a built-in timer to simulate real exam pressure and boost your speed.

Take your time to read instructions before taking this test.

There are 40 questions which you are to answer in 15 minutes that gives you roughly 30 seconds per question.

If you can get at least 60%, you can be rest assured that you’ll ace CHM 101 exam

In a normal exam you will be asked between 40 – 60 questions but I only arranged 40 questions

Note

Do not be in a hurry to answer the questions

Do not waste time on a question you don’t know

Move as fast as possible and starting with questions that don’t have calculation first to save time

Always crosscheck

Don’t be in a hurry to submit, you are not in a competition

Don’t be scared. Getting an A is easy

Don’t be over confident, you can end up a D, E or F. Calm your blood, no be only you sabi book

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Created on April 24, 2025 By

Phil

EBSU CHM 101

1 / 50

1. Of the following, which element has the highest first ionization energy

A. Chlorine

B. Iodine

C. Fluorine

D. Bromine

2 / 50

2. A zeroth order reaction is one whose

A. Rate is zero

B. Rate is independent of reactant concentration

C. Rate can be found where [A] t =-kt + ln[A] o

D. Rate is dependent on none of the reactants

3 / 50

The effect of ionizing radiation depend on

A. Location of source (internal or external)

B. All of the above

C. Type and energy of radiation

D. Length of exposure to radiation

4 / 50

4. Radiation is detected by its ___________ properties

A. Gravitational

B. Thermal

C. Ionizing

D. Kinetic

5 / 50

What is the minimum energy barrier that must be overcome for a chemical reaction to occur

A. Potential Energy

B. Rate limiting energy

C. Net energy

D. Activation Energy

6 / 50

6. Chlorine belongs to the ____________ group on the periodic table

A. Alkaline earth metal

B. Halogen

C. Alkali metal

D. Noble

7 / 50

7. The change in the concentration of reactant or product per unit time is known as

A. Molecularity of a reaction

B. Rate of a reaction

C. Order of a reaction

D. Rate Law

8 / 50

8. Which group reacts violently with water?

A. Alkaline earth metal

B. Noble gases

C. Alkali metals

D. Halogens

9 / 50

9. An element that has the valence electronic configuration 3s2 3p3 belongs to which period and group?

A. Period 4 and Group 3A

B. Period 3 And Group 5A

C. Period 4 and Group 5A

D. Period 3 And Group 3A

10 / 50

10. Zinc and carbon rods are used as anode and cathode respectively in a

A. Daniel cell

B. voltaic cell

C. Leclanche cell

D. lead accumulator

11 / 50

11. How many grams of nickel metal are plated out when a constant current of 15.0A is passed through aqueous NiCl2 for 80.0 minutes

A. 48.4g

B. 21.9g

C. 14.7g

D. 43.8g

12 / 50

12. The factor 0.001 corresponds to which prefix

A. deka

B. Milli

C. Deci

D. Centi

13 / 50

13. What is the minimum energy barrier that must be overcomed for a chemical reaction to occur

A. Potential Energy

B. Rate Limiting Energy

C. Activation Energy

D. Net Energy

14 / 50

14. Isotopes have the same number of __________ but different numbers of ___________ in their nuclei

A. Nucleon, neutron

B. Protons, neutrons

C. Protons, electrons

D. Electron, neutron

15 / 50

15. The powers to which the concentration of each reactant is raised to give a correct dependence of rate on concentration is termed

A. Molecularity of reaction

B. Order of reaction

C. Equilibrium Law

D. Rate Equation

16 / 50

16. A substance that ionizes in solution to produce hydroxyl ion is

A. Acid

B. Base

C. Salt

D. Lewis Acid

17 / 50

17. Water is best described as

A. Acid

B. Ampiteric

C. Base

D. Amphoteric

18 / 50

18. Catalyst ................... the rate of reaction by ................... the activation energy

A. decreases/raising

B. increases/raising

C. decreases/lowering

D. increases/lowering

19 / 50

19. Gamma radiation can be described as

A. A helium nucleus

B. High energy electromagnetic radiation

C. A negatively charged free electron

D. positively charged free electron

20 / 50

20. The solution that will conduct the highest amount of electricity is

A. 2.0 mol dm-3 of hydrochloric acid

B. 0.5 mol dm-3 ethanoic acid

C. 0.5 mol dm-3 of hydrochloric acid

D. 2.0 mol dm-3 ethanoic acid

21 / 50

21. Using the method of initial rates for the reaction A➡B, if the initial concentration of A is doubled and the rate of reaction quadruples, what is the order of reaction with respect to A?

A. Second

B. Fourth

C. First

D. Zeroth

22 / 50

22. Water is an example of

A. An ion

B. An element

C. A mixture

D. Compound

23 / 50

23. Substances that dissolve in water to release hydroxonium ion is known as

A. Base

B. Salt

C. Acid

D. Lewis Base

24 / 50

24. According to history, the concept that all matter is composed of atom was first proposed by

A. Dalton but not accepted until the work of Einstein

B. Democritus but not widely accepted till modern times

C. Dalton but not accepted till Mendelev

D. Dalton and widely accepted within a few decades

25 / 50

25. A saturated solution is defined as

A. A concentrated solution

B. A solution that is in equilibrium with pure solute

C. A solution that is in equilibrium with undisolved solute

D. A solution that is not in equilibrium with both pure solvent and undissolved solute

26 / 50

26. What is the oxidation number of the chromium atom in K2Cr2O7

A. -2

B. +3

C. +6

D. +7

27 / 50

27. Elements with ___________ atomic mass are best possible candidates for a fusion reaction

A. Very heavy

B. Moderate

C. Very low

D. Moderate to heavy

28 / 50

28. Which of the following can be classified as a weak base?

A. NH2OH

B. CH3NH2

C. Both CH3NH2 and NH2OH

D. None of these

29 / 50

29. Order of a given reaction can only be determined

A. From the Rate Equation

B. From the Molecuarity of reaction

C. Experimentally

D. From the chemical reaction

30 / 50

30. Catalyst speeds up the rate of

A. Both forward and reverse reaction

B. Forward Reaction

C. All reactions

D. Reverse Reaction

31 / 50

31. Elements in a periodic group have similar

A. Densities

B. Chemical properties

C. Masses

D. Physical properties

32 / 50

32. What is the electronic configuration of Potassium (K)?

A. 1s2 2s2 2p6

B. 1s2 2s2 2p6 3s2 3p6 4s1

C. 1s2 2s2 2p6 3s2

D. 1s2 2s2 2p6 3s2 3p6

33 / 50

33. If 30cm³ of gas at 50^oC is warmed to 80^o at a fixed pressure, the fractional increase in volume is

A. 0.009

B. 1.090

C. 0.910

D. 0.093

34 / 50

34. The half-life of a first order reaction depends on

A. Rate constant

B. Initial concentration of the reactants

C. Concentration of the reactant left

D. Concentration of product

35 / 50

35. The sum of all exponents of the reactants as contained in the experimentally determined rate law is known as

A. Overall order of reaction

B. Overall molecularity of reaction

C. Overall rate law

D. Overall equilibrium law

36 / 50

36. Which of the following is not an Arrhenius acid?

A. KOH

B. HF

C. H2SO3

D. HCLO

37 / 50

37. How many grams of KNO3 are needed to make 250ML of a solution that is 0.135M

A. 1.71g

B. 0.341g

C. 3.41g

D. 6.82g

38 / 50

38. The binding energy is defined as

A. The amount of energy released when electrons are removed from the atom

B. The amount of energy required to break apart a nucleus into individual protons and neutrons

C. The amount of energy absorbed when protons and neutrons form a nucleus

D. The amount of energy absorbed when electrons are added to an ion

39 / 50

39. An element with atomic number twelve is likely to be

A. covalent with a valency of 2

B. electrovalent with a valency of 2

C. covalent with a valency of 4

D. electrovalent with a velocity of 1

40 / 50

40. What symbol is used to express the facor,10^-6?

A. n

B. µ

C. m

D. M

41 / 50

41. An expression which shows how a reaction is related to concentration is termed

A. Order of reaction

B. Equilibrium Law

C. Molecularity of reaction

D. Rate Equation

42 / 50

42. Which cell involves a non-spontaneous redox reaction?

A. Galvanic cell

B. Fuel Cell

C. Concentration cell

D. Electrolytic Cell

43 / 50

43. Which of the following is not used to describe the condition of a gas?

A. Temperature

B. Number of moles

C. Electronic configuration

D. Pressure

44 / 50

44. Calculate the percentage composition of Nitrogen in Magnesium Nitrate Mg(No3)2

Mg =24.31

N= 14.01

O= 16

A. 1.889%

B. 0.1889%

C. 0.01889%

D. 18.99%

45 / 50

45.

Which of the following can be interpreted as a measure of randomness

A. Free Energy

B. Entropy

C. Enthalpy

D. Temperature

46 / 50

46. The Element that best describes Alpha decay is?

A. Calcium

B. Sodium

C. Helium

D. Methane

47 / 50

47. The rate of a reaction is directly proportional to the concentration of reactants. This is referred to as

A. Overall order of a Reaction

B. Molecularity of a Reaction

C. Order of a Reaction

D. Rate of a Reaction

48 / 50

48. Does temperature changes affect the equilibrium constant of a reaction?

A. Yes it does

B. No it does

C. No it doesn't

D. Yes it doesn't

49 / 50

49. What mass of HNO3(63g/mol) is contained in 300ml of 0.30 M HNO3 solution!

A. 5.67g

B. 30g

C. 6.3g

D. 0.3g

50 / 50

50. Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore,

A. Q will form a covalent bond with S

B. R will form an electrovalent bond with S

C. P will form an electrovalent bond with R

D. Q will form an electrovalent bond with S

Your score is

The average score is 22%

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EBSU CHM 101 CBT Practice

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