Elements & Compounds — Homi Bhabha Class 6 Chemistry MCQs with Solutions
Free Homi Bhabha Class 6 Chemistry Elements & Compounds MCQs with step-by-step solutions (10 questions). Part of Substances & Their Composition. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Elements & Compounds · easy · theory
An element is made up of only one kind of ______.
A. atom ✓ Correct
B. solution
C. mixture
D. compound
Solution: An element contains only one kind of atom, so it cannot be broken down into any simpler substance.
Q2 — Elements & Compounds · easy · theory
Which of these is an element?
A. Oxygen (O₂) ✓ Correct
B. Salt (NaCl)
C. Water (H₂O)
D. Sugar
Solution: Oxygen is made of only oxygen atoms, so it is an element. Water, salt and sugar are compounds made of more than one element.
Q3 — Elements & Compounds · easy · theory
Water (H₂O) is an example of a ______.
A. element
B. metal
C. mixture
D. compound ✓ Correct
Solution: Water is made of two elements, hydrogen and oxygen, joined chemically in a fixed ratio, so it is a compound.
Q4 — Elements & Compounds · easy · theory
Which of the following is a compound?
A. Gold
B. Carbon dioxide (CO₂) ✓ Correct
C. Iron
D. Hydrogen
Solution: Carbon dioxide is made of carbon and oxygen joined together, so it is a compound. Gold, iron and hydrogen are elements.
Q5 — Elements & Compounds · medium · theory
A compound is formed when two or more elements ______.
A. are the same kind of atom
B. are placed side by side
C. are simply mixed together
D. combine chemically in a fixed ratio ✓ Correct
Solution: In a compound the elements join by a chemical change in a fixed ratio, forming a new substance — not just a loose mixture.
Q6 — Elements & Compounds · medium · theory
Which statement about an element is correct?
A. It can be separated by filtering
B. It contains two different kinds of atoms
C. It cannot be broken down into simpler substances by chemical means ✓ Correct
D. It is always a mixture
Solution: An element is the simplest form of matter and cannot be broken down into anything simpler by ordinary chemical methods.
Q7 — Elements & Compounds · medium · theory
Water can be broken down into hydrogen and oxygen. This proves that water is a ______.
A. pure element
B. element
C. single atom
D. compound ✓ Correct
Solution: Because water can be split into two different elements (hydrogen and oxygen), it must be a compound, not an element.
Q8 — Elements & Compounds · medium · theory
The formula H₂O tells us that one molecule of water is made of ______.
A. 2 hydrogen atoms and 2 oxygen atoms
B. 2 hydrogen atoms and 1 oxygen atom ✓ Correct
C. only hydrogen atoms
D. 1 hydrogen atom and 2 oxygen atoms
Solution: The small "2" after H means two hydrogen atoms, and O with no number means one oxygen atom, so H₂O is 2 hydrogen + 1 oxygen.
Q9 — Elements & Compounds · hard · theory
Which list contains ONLY elements?
A. Hydrogen, water and oxygen
B. Carbon, sugar and gold
C. Iron, oxygen and gold ✓ Correct
D. Water, iron and salt
Solution: Iron, oxygen and gold are all made of one kind of atom, so all are elements. The other lists include compounds like water, salt and sugar.
Q10 — Elements & Compounds · hard · theory
Table salt (NaCl) is made of sodium, a soft metal, and chlorine, a poisonous gas — yet salt is safe to eat. This is because in a compound ______.
A. salt is only a loose mixture of the two
B. no chemical change takes place
C. the elements form a new substance with new properties ✓ Correct
D. the elements keep their own properties
Solution: When elements combine into a compound, a completely new substance forms with new properties, so salt is nothing like sodium or chlorine on their own.