PES SS 1 Chemistry Test 3 Term 1 2025-26
- 1. Which of the following laboratory equipment is used for accurately measuring and transferring the needed volume of acid during a titration experiment?
A) flask
B) test tube
C) burette
D) pipette
- 2. Which of the following laboratory equipment is used for heating, sterilizing and performing combustion reactions?
A) thermometer
B) ice bath
C) Bunsen burner
D) hot plate
- 3. Which of these is the correct formula for Sodium trioxocarbonate (IV)?
A) Na(CO3)_2
B) NaCO3
C) Na2CO2
D) Na2CO3
- 4. Which of these is the correct formula for Iron (II) trioxonitrate (V)?
A) Fe(NO3)_2
B) FeNO3
C) Fe2(NO3)_3
D) Fe2NO3
- 5. Which of these is the correct formula for Iron (III) hydroxide?
A) FeOH
B) Fe3OH
C) Fe3(OH)_2
D) Fe(OH)_3
- 6. Which of these is the correct formula for Aluminium oxide?
A) AlO
B) Al3O2
C) AlO3
D) Al2O3
- 7. Which of these is the correct formula for Magnesium trioxonitrate (V)?
A) Mg(NO3)_2
B) Mg2(NO3)_3
C) MgNO3
D) Mg2NO3
- 8. Calculate the percentage by mass of Mg in Mg(OH)_2. [Mg = 24, O = 16, H = 1]
A) 41.4%
B) 35.6%
C) 3.4%
D) 55.2%
- 9. Calculate the percentage by mass of O in Mg(OH)_2. [Mg = 24, O = 16, H = 1]
A) 35.6%
B) 41.4%
C) 3.4%
D) 55.2%
- 10. Calculate the percentage by mass of H in Mg(OH)_2. [Mg = 24, O = 16, H = 1]
A) 55.2%
B) 35.6%
C) 3.4%
D) 41.4%
- 11. Which of these represents the electronic configuration of Potassium?
A) 1s2 2s2 2p6 3s2 3p7
B) 1s2 2s2 2p6 3s2 3p4 4s3
C) 1s2 2s2 2p6 3s2 3p6 4s1
D) 1s2 2s2 2p6 3s2 3p6 4s2
- 12. Which of these represents the electronic configuration of Oxygen?
A) 1s2 2s2 2p5
B) 1s2 2s2 2p4
C) 1s2 2s2 2p6
D) 1s2 2s2 2p3
- 13. Which of these represents the electronic configuration of Copper?
A) 1s2 2s2 2p6 3s2 3p6 3d10 4s1
B) 1s2 2s2 2p6 3s2 3p6 4s2 3d9
C) 1s2 2s2 2p6 3s2 3p6 4s2 3d10
D) 1s2 2s2 2p6 3s2 3p6 3d10 4s2
- 14. "No two electrons in an atom can have the same values for all the four quantum numbers" is a statement of _____
A) Aufbau Principle
B) Pauli Exclusion Principle
C) Hund's Rule
- 15. "Electrons are distributed among the orbitals of the same subshell singly before pairing occurs" is a statement of _______
A) Pauli Exclusion Principle
B) Aufbau Principle
C) Hund's Rule
- 16. "Electrons occupy the lowest available energy levels" is a statement of ______
A) Hund's Rule
B) Aufbau Principle
C) Pauli Exclusion Principle
- 17. Which of the following orbitals is spherical in shape?
A) d
B) p
C) f
D) s
- 18. Which of the following orbitals is dumbbell in shape?
A) p
B) f
C) d
D) s
- 19. The d-orbital has _____ orbitals per energy level. Type your answer in figure only.
- 20. The f-orbital can hold up to ____ electrons. Type your answer in figures only.
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