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Mock Exam Chemistry Examination For 12 Students Based on Grade 11 Unit 2 Chemical Bonding) & Grade 11 Unit 3 Physical State of Matter
Time Allowed: 1:30 Hour Number of Items: 40

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1. Which of the following types of chemical bonding occurs when electrons are completely transferred from one atom to another, resulting in oppositely charged ions?

1 point

A. Covalent bonding

B. Ionic bonding

C. Hydrogen bonding

D. Metallic bonding

Clear selection

2. 2 mols of the gas would have what volume at STP?

1 point

11.2 L

44.8 L

0 L

22.4 L

Clear selection

3. Which of the following is characteristic of gases?

1 point

A. Definite shape and volume

B. Definite shape but no definite volume

C. Indefinite shape and definite volume

D. Indefinite shape and volume

Clear selection

4. Which of the following phase changes involves the transition from a liquid to a gas?

1 point

A. Sublimation

B. Condensation

C. Evaporation

D. Freezing

Clear selection

5. The boiling point of a substance is:

1 point

A. The temperature at which its vapor pressure is equal to the external pressure

B. The temperature at which all the molecules are in the gas phase

C. The temperature at which a substance changes from solid to liquid

D. The temperature at which it evaporates rapidly

Clear selection

6. Which of the following describes the behavior of gases?

1 point

A. Gas molecules are in constant, random motion and spread out to fill any container

B. Gas molecules are packed closely together and vibrate in place

C. Gas molecules have strong intermolecular forces

D. Gas molecules have definite shapes and volumes

Clear selection

7. When the pressure on a gas is increased at constant temperature, the volume of the gas:

1 point

A. Increases

B. Decreases

C. Remains constant

D. Becomes zero

Clear selection

8. In which phase of matter are particles closest together and in a fixed position?

1 point

A. Gas

B. Liquid

C. Solid

D. Plasma

Clear selection

9. Which of the following substances is classified as a covalent compound?

1 point

A. NaCl

B. HCl

C. MgO

D. CaCl₂

Clear selection

10. The volume of a gas is directly proportional to its temperature (in Kelvin) at constant pressure. This is stated by:

1 point

A. Boyle’s Law

B. Charles’s Law

C. Avogadro’s Law

D. Gay-Lussac’s Law

Clear selection

11. Which of the following ionic compounds is expected to have the strongest lattice energy?

1 point

A. MgO

B. NaCl

C. KBr

D. CaF₂

Clear selection

12. A gas occupies a volume of 3.0 L at 300 K and 2.0 atm pressure. What will be the volume of the gas at 600 K, assuming pressure is constant?

1 point

A. 1.5 L

B. 3.0 L

C. 6.0 L

D. 9.0 L

Clear selection

13. If 5 moles of an ideal gas are at 1.0 atm pressure and 273 K, what is the volume of the gas? (Use the ideal gas constant R = 0.0821 L·atm/mol·K)

1 point

A. 1.0 L

B. 112.3L

C. 45.6 L

D. 224 L

Clear selection

14. A gas occupies 15.0 L at 300 K and 2.0 atm. If the temperature is reduced to 150 K, what will be the new pressure?

1 point

A. 1.0 atm

B. 2.0 atm

C. 3.0 atm

D. 4.0 atm

Clear selection

15. Which of the following is CORRECT about ionic bonding?

1 point

A. Ionic bonding occurs by sharing valence electrons.

B. Ionic bonding is formed between atoms of similar electronegativities.

C. Ionic bonding involves the complete transfer of electrons from one atom to another.

D. Ionic bonding occurs between two nonmetals.

Clear selection

16. Which of the following compounds contains both ionic and covalent bonds?

1 point

A. KNO₃

B. H₂O

C. CO₂

D. NaCl

Clear selection

17. Which of the following sets contains only ionic compounds?

1 point

A. NaCl, MgO, KBr

B. H₂O, CO₂, NH₃

C. BCl₃, CaF₂, Na₂O

D. CH₄, CCl₄, PCl₃

Clear selection

18. How many electron pair are shared between two atoms in a Triple bond?

1 point

A.4

B.6

C.2

D.3

Clear selection

19. The total number of electrons participating in the bond formation of sulfate anion, SO₄²⁻, is:

1 point

A. 12

B. 16

C. 8

D. 20

Clear selection

20. How many bonding pairs and lone pairs , respectively does the ion NH3 have?

1 point

A.3, 2

B.5,1

C.3, 1

D.3, 0

Clear selection

21. Which of the following compounds contains a coordinate covalent bond?

1 point

A. H₂O

B. NH₃

C. CO₂

D. NH₄⁺

Clear selection

22. The number of resonance structures for the nitrate ion (NO₃⁻) is:

1 point

A. 3

B. 4

C. 2

D. 5

Clear selection

23. Which of the following is an example of an exception to the octet rule?

1 point

A. CO₂

B. H₂O

C. CH₄

D. BF₃

Clear selection

24. Which of the following molecules is non-polar?

1 point

A. CO₂

B. NH₃

C. H₂O

D. CH₃Cl

Clear selection

25. Which of the following molecules has a dipole moment?

1 point

A. CO₂

B. BF₃

C. NH₃

D. CH₄

Clear selection

26. Both water (H₂O) and hydrogen sulfide (H₂S) are bent molecules. H₂O is polar, whereas H₂S is non-polar. This is because:

1 point

A. H₂O has a net dipole moment, while H₂S does not.

B. Oxygen is more electronegative than sulfur.

C. The H-O-H bond angle in H₂O is greater than the H-S-H bond angle in H₂S.

D. Both molecules have the same electronegativity difference between hydrogen and the central atom.

Clear selection

27. The molecule of methane (CH₄) has four polar C-H bonds. However, CH₄ is a non-polar molecule. Which of the following explains the reason for the observed property of CH₄?

1 point

A. The molecule is non-polar because of the presence of four polar C-H bonds in the molecule.

B. The molecule is non-polar because of the difference in electronegativity between carbon and hydrogen.

C. Even though the bonds in CH₄ are polar, the net dipole moment of the molecule is different from zero.

D. Even though the bonds in CH₄ are polar, the net dipole moment of the molecule is zero.

Clear selection

28. Which of the following properties is true about covalent molecules?

1 point

A. High electrical and thermal conductivity

B. Low melting and boiling points

C. Low melting but high boiling points

D. High melting but low boiling points

Clear selection

29. Phosphorus (P) is a group V element. What will be the molecular geometry and number of lone pair electrons, respectively, that exists in the ion [PF₆]⁻?

1 point

A. Octahedral, 1

B. Tetrahedral, 2

C. Square pyramidal, 2

D. Octahedral, 0

Clear selection

30. The molecular geometry of the NH3 is

1 point

A.bent

B.trigonal pyramidal

C.Linear

D.tetrahedral

Clear selection

31. How many π bonds are present in ethene (C₂H₄)?

1 point

A. One

B. Two

C. Three

D. Four

Clear selection

32. Which of the following contains an sp³ hybridized atom?

1 point

A. CH₄

B. CO₂

C. H₂O

D. C₂H₄

Clear selection

33. Which of the following molecular orbital diagram is correct for the Boron (B2)?

1 point

A.σ1s2 σ*1s2 σ2s2 σ*2s2 (π2py2 = π2pz2) (π2*py2 = π2*pz2)

B.σ1s2 σ*1s2 σ2s2 σ*2s2 (π2py1 = π2pz1)

C.σ1s2 σ*1s2 σ2s2 σ*2s2 (π2py2 = π2pz2)

D.σ1s2 σ*1s2 σ2s2σ*2s2 π2p4 σ2p2

Clear selection

34. Which of the following is the most stable?

1 point

A.CN+

B.C2+

C.CN

D.CN-

Clear selection

35. Which of the following statements is not a postulate of the kinetic molecular theory of gases?

1 point

A) Gas particles are in constant random motion.

B) The volume of the gas particles is negligible compared to the container volume.

C) Gas particles attract each other through weak forces.

D) Collisions between gas particles are perfectly elastic.

Clear selection

36. According to the kinetic molecular theory, the temperature of a gas is directly proportional to the:

1 point

A) Average speed of gas molecules.

B) Number of gas molecules in a container.

C) Volume of the gas container.

D) Total pressure exerted by the gas.

Clear selection

37. Two gases, Gas A and Gas B, are diffusing through the same medium. The molar masses of Gas A and Gas B are 32 g/mol and 64 g/mol, respectively. Using Graham's Law of Diffusion, calculate the ratio of the rates of diffusion of Gas A to Gas B.

1 point

A) 1:2

B) 1.4 :1

C) 4:1

D) 1:4

Clear selection

38. Which of the following statements best describes the relationship between the rates of diffusion of two gases according to Graham’s law?

1 point

A) The rate of diffusion of a gas is directly proportional to the square root of its molar mass.

B) The rate of diffusion of a gas is inversely proportional to the square root of its molar mass.

C) The rate of diffusion of a gas is directly proportional to its temperature.

D) The rate of diffusion of a gas is independent of the molar mass.

Clear selection

39. According to the molecular orbital theory, which one of the following is paramagnetic?

1 point

A. F2

B. H2

C. O2

D. NO+

Clear selection

40. Which of the following crystals possess high electrical and thermal conductivities?

1 point

A. Ionic crystals

B. Metallic crystals

C. Molecular crystals

D. Covalent network crystals

Clear selection

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