Nature of Matter: Elements, Compounds, and Mixtures Class 8 MCQ Questions Science Chapter 8

These Class 8 Science MCQ and Class 8 Science Chapter 8 Nature of Matter: Elements, Compounds, and Mixtures MCQ Questions Online Test with Answers focus on both theory and practical applications.

Class 8 Nature of Matter: Elements, Compounds, and Mixtures MCQ with Answers

MCQ on Nature of Matter: Elements, Compounds, and Mixtures Class 8

Class 8 Science Chapter 8 Nature of Matter: Elements, Compounds, and Mixtures MCQ Questions with Answers

Question 1.
Which of the following is an element?
(a) Water
(b) Sodium
(c) Sugar
(d) Air
Answer:
(b) Sodium

Question 2.
A compound is formed when
(a) Two solids are mixed
(b) Two gases are combined physically
(c) Two or more elements combine chemically
(d) One element changes state
Answer:
(c) Two or more elements combine chemically

Question 3.
Which of the following is a mixture?
(a) Carbon dioxide
(b) Air
(c) Salt
(d) Glucose
Answer:
(b) Air

Question 4.
Which of the following cannot be broken down by chemical means?
(a) Water
(b) Iron
(c) Salt
(d) Baking soda
Answer:
(b) Iron

Question 5.
What is the smallest unit of an element?
(a) Molecule
(b) Cell
(c) Atom
(d) Compound
Answer:
(c) Atom

Question 6.
Which of the following has a variable composition?
(a) Element
(b) Compound
(c) Mixture
(d) Molecule
Answer:
(c) Mixture

Question 7.
What kind of substance is pure and has identical properties throughout?
(a) Mixture
(b) Element
(c) Non-uniform mixture
(d) Suspension
Answer:
(b) Element

Question 8.
Which of the following best describes a mixture?
(a) Chemically bonded atoms
(b) Uniform composition always
(c) Substances physically combined
(d) Fixed formula
Answer:
(c) Substances physically combined

Question 9.
Which of these is NOT true for a compound?
(a) Has a fixed ratio
(b) Its components can be separated by a physical method
(c) Formed by chemical combination
(d) Has different properties from its elements
Answer:
(b) Its components can be separated by a physical method

Question 10.
A solution of salt in water is an example of
(a) Compound
(b) Element
(c) Uniform mixture
(d) Non-uniform mixture
Answer:
(d) Non-uniform mixture

Nature of Matter: Elements, Compounds, and Mixtures Class 8 Assertion and Reason Questions

Two statements are given – Assertion (A) and Reason (R). Please read them carefully and choose the correct option.

Question 1.
Assertion (A): All elements are substances made of identical atoms.
Reason (R): Elements cannot be separated into simpler substances by chemical means.
Codes:
(a) Both (A) and (R) are true, and (R) is the correct explanation of (A).
(b) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(c) (A) is true, but (R) is false.
(d) (A) is false, but (R) is true.
Answer:
(a) Both (A) and (R) are true, and (R) is the correct explanation of (A).

Question 2.
Assertion (A): Mixtures do not have a fixed composition.
Reason (R): The components of the mixture are chemically bonded.
Codes:
(a) Both (A) and (R) are true, and (R) is the correct explanation of (A).
(b) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(c) (A) is true, but (R) is false.
(d) (A) is false, but (R) is true.
Answer:
(c) (A) is true, but (R) is false.

Nature of Matter: Elements, Compounds, and Mixtures Class 8 Fill in the blanks

Question 1.
A substance made of only one kind of atom is called an ________________
Answer:
Element

Question 2.
The simplest form of matter that cannot be broken down by chemical ________________
Answer:
Element

Question 3.
Two or more elements chemically combined form a ________________
Answer:
Compound

Question 4.
A combination of substances not chemically bonded is called ________________
Answer:
Mixture

Question 5.
________________ are the building block of all substances.
Answer:
Atoms

Question 6.
Sodium (Na) & Chlorine (Cl) combine to form ________________
Answer:
Sodium Chloride

Question 7.
________________ can be separated by physical methods such as filtration or evaporation.
Answer:
Mixtures

Question 8.
In a compound, atoms are bonded together in a definite ________________
Answer:
Ratio

Question 9.
Sugar and water form a ________________ mixture.
Answer:
Uniform

Question 10.
Compound has ________________ properties than the elements that form it.
Answer:
Different

Nature of Matter: Elements, Compounds, and Mixtures Class 8 True or False

Question 1.
Elements are made up of different types of atoms.
Answer:
True

Question 2.
A compound contains atoms of only one element.
Answer:
False

Question 3.
Compounds always have a fixed chemical composition.
Answer:
True

Question 4.
The smallest particle of an element is a molecule.
Answer:
True

Question 5.
Oxygen and hydrogen gases can chemically react to form water.
Answer:
True

Question 6.
Evaporation is a physical method used to separate salt from water.
Answer:
True

Question 7.
Copper is an element and a good conductor of electricity.
Answer:
True

Question 8.
A compound can be created from one atom.
Answer:
False

Nature of Matter: Elements, Compounds, and Mixtures Class 8 Match the following

Question 1.

Column A	Column B
1. Oxygen	(a) Mixture of gases
2. Sodium Chloride (NaCl)	(b) Element
3. Air	(c) Compound
4. Carbon	(d) Made of Sodium & Chlorine
5. Salt Water	(e) Solution (mixture)

Answer:

Column A	Column B
1. Oxygen	(b) Element
2. Sodium Chloride (NaCl)	(d) Made of Sodium & Chlorine
3. Air	(a) Mixture of gases
4. Carbon dioxide	(c) Compound
5. Salt Water	(e) Solution (mixture)

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