Dalton's Atomic Theory — Homi Bhabha Exam Chemistry MCQs with Solutions
Free Homi Bhabha Exam Chemistry Dalton's Atomic Theory MCQs with step-by-step solutions (5 questions). Part of Atoms, Molecules & Structure. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Dalton's Atomic Theory · medium · theory
According to Dalton's atomic theory, the smallest particle of matter that takes part in a chemical reaction is the:
A. atom ✓ Correct
B. proton
C. electron
D. molecule
Solution: Dalton proposed that atoms are the smallest indivisible particles taking part in chemical reactions.
Q2 — Dalton's Atomic Theory · medium · theory
According to Dalton, atoms of the same element are:
A. made of molecules
B. identical in mass and properties ✓ Correct
C. divisible into protons
D. always different
Solution: Dalton stated that all atoms of a given element are alike in mass and chemical properties.
Q3 — Dalton's Atomic Theory · hard · theory
Which postulate of Dalton's atomic theory was later found to be incorrect?
A. Matter is made up of atoms
B. Atoms combine in small whole-number ratios
C. Atoms of different elements differ
D. Atoms are indivisible ✓ Correct
Solution: Atoms are actually divisible into protons, neutrons and electrons, so this postulate is wrong.
Q4 — Dalton's Atomic Theory · medium · theory
Dalton's theory explains that atoms combine to form compounds in:
A. random fractional ratios
B. small whole-number ratios ✓ Correct
C. ratios that keep changing
D. a 1:1 ratio only
Solution: Atoms of different elements combine in simple whole-number ratios to form compounds.
Q5 — Dalton's Atomic Theory · hard · theory
The idea that during a chemical reaction atoms are neither created nor destroyed but only rearranged is consistent with:
A. the discovery of isotopes
B. the mole concept
C. the law of constant proportion only
D. the law of conservation of mass ✓ Correct
Solution: Since atoms are merely rearranged, the total mass is conserved.