MI018MTTC Chemistry Practice Exam
**Question 1. Which state of matter has a definite volume but no definite
shape?**
A) Solid
B) Liquid
C) Gas
D) Plasma
Answer: B
Explanation: Liquids maintain a fixed volume but take the shape of their container,
unlike solids (fixed shape) and gases (neither fixed shape nor volume).
**Question 2. Which method is most suitable for separating a mixture of sand and
salt?**
A) Distillation
B) Filtration
C) Chromatography
D) Sublimation
Answer: B
Explanation: Filtration separates an insoluble solid (sand) from a soluble solid
(salt) dissolved in water; the salt can later be recovered by evaporation.
**Question 3. The number of significant figures in the measurement 0.004560 g
is:**
A) 3
, MI018MTTC Chemistry Practice Exam
B) 4
C) 5
D) 6
Answer: C
Explanation: Leading zeros are not significant; the digits 4560 are, giving four
significant figures. The trailing zero after the decimal is also significant, making
five.
**Question 4. Which of the following is a physical change?**
A) Burning of methane
B) Rusting of iron
C) Dissolving sugar in water
D) Decomposition of hydrogen peroxide
Answer: C
Explanation: Dissolving sugar does not alter its chemical composition; it is a
reversible physical process.
**Question 5. The atomic model that introduced the concept of quantized
electron shells was proposed by:**
A) Dalton
B) Thomson
C) Rutherford
, MI018MTTC Chemistry Practice Exam
D) Bohr
Answer: D
Explanation: Bohr’s model (1913) described electrons moving in discrete energy
levels (shells) around the nucleus.
**Question 6. An isotope of chlorine has a mass number of 37. How many
neutrons does it contain?**
A) 17
B) 18
C) 35
D) 36
Answer: B
Explanation: Chlorine atomic number = 17 (protons). Neutrons = mass number –
atomic number = 37 – 17 = 20. (Correction: 37 – 17 = 20, but answer choices do
not include 20; the correct isotope is ^37Cl with 20 neutrons. Since none match,
the intended answer is 20; however, given the options, the closest is B) 18, which
is incorrect. To avoid confusion, replace with correct numbers.)
**Corrected Question 6. An isotope of chlorine has a mass number of 35. How
many neutrons does it contain?**
A) 17
B) 18
C) 35
D) 36
, MI018MTTC Chemistry Practice Exam
Answer: B
Explanation: Chlorine atomic number = 17; neutrons = 35 – 17 = 18.
**Question 7. The electron configuration of the Ca²⁺ ion is:**
A) [Ar] 4s²
B) [Ar]
C) [Ar] 3d²
D) [Ne] 3s² 3p⁶
Answer: B
Explanation: Calcium loses two 4s electrons to form Ca²⁺, leaving the noble‑gas
configuration of argon, [Ar].
**Question 8. Across a period from left to right, atomic radius generally:**
A) Increases
B) Decreases
C) Remains constant
D) First increases then decreases
Answer: B
Explanation: Increasing nuclear charge pulls electrons closer, reducing atomic size
across a period.
**Question 9. Which element has the highest first ionization energy?**
**Question 1. Which state of matter has a definite volume but no definite
shape?**
A) Solid
B) Liquid
C) Gas
D) Plasma
Answer: B
Explanation: Liquids maintain a fixed volume but take the shape of their container,
unlike solids (fixed shape) and gases (neither fixed shape nor volume).
**Question 2. Which method is most suitable for separating a mixture of sand and
salt?**
A) Distillation
B) Filtration
C) Chromatography
D) Sublimation
Answer: B
Explanation: Filtration separates an insoluble solid (sand) from a soluble solid
(salt) dissolved in water; the salt can later be recovered by evaporation.
**Question 3. The number of significant figures in the measurement 0.004560 g
is:**
A) 3
, MI018MTTC Chemistry Practice Exam
B) 4
C) 5
D) 6
Answer: C
Explanation: Leading zeros are not significant; the digits 4560 are, giving four
significant figures. The trailing zero after the decimal is also significant, making
five.
**Question 4. Which of the following is a physical change?**
A) Burning of methane
B) Rusting of iron
C) Dissolving sugar in water
D) Decomposition of hydrogen peroxide
Answer: C
Explanation: Dissolving sugar does not alter its chemical composition; it is a
reversible physical process.
**Question 5. The atomic model that introduced the concept of quantized
electron shells was proposed by:**
A) Dalton
B) Thomson
C) Rutherford
, MI018MTTC Chemistry Practice Exam
D) Bohr
Answer: D
Explanation: Bohr’s model (1913) described electrons moving in discrete energy
levels (shells) around the nucleus.
**Question 6. An isotope of chlorine has a mass number of 37. How many
neutrons does it contain?**
A) 17
B) 18
C) 35
D) 36
Answer: B
Explanation: Chlorine atomic number = 17 (protons). Neutrons = mass number –
atomic number = 37 – 17 = 20. (Correction: 37 – 17 = 20, but answer choices do
not include 20; the correct isotope is ^37Cl with 20 neutrons. Since none match,
the intended answer is 20; however, given the options, the closest is B) 18, which
is incorrect. To avoid confusion, replace with correct numbers.)
**Corrected Question 6. An isotope of chlorine has a mass number of 35. How
many neutrons does it contain?**
A) 17
B) 18
C) 35
D) 36
, MI018MTTC Chemistry Practice Exam
Answer: B
Explanation: Chlorine atomic number = 17; neutrons = 35 – 17 = 18.
**Question 7. The electron configuration of the Ca²⁺ ion is:**
A) [Ar] 4s²
B) [Ar]
C) [Ar] 3d²
D) [Ne] 3s² 3p⁶
Answer: B
Explanation: Calcium loses two 4s electrons to form Ca²⁺, leaving the noble‑gas
configuration of argon, [Ar].
**Question 8. Across a period from left to right, atomic radius generally:**
A) Increases
B) Decreases
C) Remains constant
D) First increases then decreases
Answer: B
Explanation: Increasing nuclear charge pulls electrons closer, reducing atomic size
across a period.
**Question 9. Which element has the highest first ionization energy?**
