Dalton's Atomic Theory( Concept of Atom, Molecule, Element, and Compound) NEET Questions

Physical Chemistry - Some Basic Concepts of Chemistry

Dalton's Atomic Theory( Concept of Atom, Molecule, Element, and Compound) MCQ Questions


13.
The discovery of ISOBARS (atoms of different elements with the same mass number) modified which Dalton's postulate?
A.
Atoms are conserved in chemical reactions
B.
Compounds form from fixed ratios of atoms
C.
Atoms are indivisible
D.
Atoms of different elements differ in all properties including mass
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ANSWER :
D. Atoms of different elements differ in all properties including mass
14.
Which law could Dalton's atomic theory NOT explain?
A.
Law of Multiple Proportions
B.
Law of Conservation of Mass
C.
Gay-Lussac's Law of Gaseous Volumes
D.
Law of Definite Proportions
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ANSWER :
C. Gay-Lussac's Law of Gaseous Volumes
15.
Which of the following is a LIMITATION of Dalton's atomic theory?
A.
It supported the law of multiple proportions
B.
It could not explain why atoms combine to form compounds
C.
It introduced the concept of relative atomic masses
D.
It accounted for the law of conservation of mass
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ANSWER :
B. It could not explain why atoms combine to form compounds
16.
Dalton's atomic theory did not provide an explanation for:
A.
The whole-number ratio of element masses
B.
The forces holding atoms together in compounds
C.
The formation of compounds in fixed ratios
D.
Conservation of mass during reactions
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ANSWER :
B. The forces holding atoms together in compounds
17.
An ATOM is best defined as:
A.
A combination of two or more elements
B.
The smallest particle of an element that retains its chemical properties
C.
The largest particle that retains the chemical identity of an element
D.
Any particle smaller than 10⁻¹⁰ meters in size
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ANSWER :
B. The smallest particle of an element that retains its chemical properties
18.
A MOLECULE is defined as:
A.
A single atom of any element
B.
Any particle visible under an electron microscope
C.
A positively charged particle in the nucleus
D.
A group of two or more atoms held together by chemical bonds
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ANSWER :
D. A group of two or more atoms held together by chemical bonds