This set of Class 11 Chemistry Chapter 1 Multiple Choice Questions & Answers (MCQs) focuses on “Dalton’s Atomic Theory”.
1. According to Dalton’s Atomic Theory, matter consists of indivisible _______
a) Molecules
b) Atoms
c) Ions
d) Mixtures
View Answer
Explanation: Atom is the basic unit of life. A molecule is a compound made up of 2 or more atoms held by chemical bonds. The mixture is a combination of pure substances in a ratio. Ion is either positively or negatively charged.
2. Atoms of different elements differ in mass.
a) True
b) False
View Answer
Explanation: Each and every element has a different mass. For example, carbon’s molecular weight is 12.0107 u, oxygen’s molecular weight is 15.999 u and nitrogen’s molecular weight is 14.0067 u. Hence it’s different for different elements.
3. What did Dalton’s Theory couldn’t explain?
a) gaseous volumes
b) conservation of mass
c) chemical philosophy
d) indivisible atoms
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Explanation: Dalton’s atomic theory couldn’t explain gaseous volumes, because as per his view, different elements have different mass but this isn’t true. This is explained by Gay lussac’s law. This is one of the major limitations of Dalton’s atomic theory.
4. What is the name of Dalton’s publication?
a) A New system of atomic Philosophy
b) An old system of Chemical Philosophy
c) A New System of Chemical Philosophy
d) A New System of Chemical Prophecy
View Answer
Explanation: Dalton published ” A New System of Chemical Philosophy” in 1808. He proposed a theory in that, that is Dalton’s atomic theory. It also has some limitations like it couldn’t explain how molecules combine i.e. their driving force.
5. Which of the following may not be explained by Dalton’s atomic theory?
a) reason for combining atoms
b) conservation of mass
c) chemical philosophy
d) indivisible atoms
View Answer
Explanation: Dalton’s atomic theory couldn’t explain the reason for combining atoms. This is one of the major limitations of Dalton’s atomic theory. Though it could explain the conservation of mass, indivisible atoms and definite proportions.
6. Law of conservation of mass isn’t explained in Dalton’s atomic theory.
a) True
b) False
View Answer
Explanation: Law of conservation of mass is explained in Dalton’s atomic theory. He said that reorganization of atoms is involved in chemical reactions. This means mass is neither created nor destroyed in a chemical reaction i.e. explained.
7. What is 1 Dalton?
a) a unified mass unit, 1.360539040(20)×10−27kg
b) a unified mass unit, 1.640539040(20)×10−27kg
c) a unified mass unit, 1.660539040(20)×10−27kg
d) a unified mass unit, 1.660539040(20)×10−27kg
View Answer
Explanation: Dalton is also known as the unified mass unit that is equal to 1.660539040(20)×10−27kg or 931.4940954(57)MeV/c2 or 1822.888486192(53)me (symbol: u, or Da or AMU). It’s a standard unit of mass on the molecular and atomic scale.
8. Could Dalton’s atomic theory explain the laws of chemical combinations?
a) No
b) Yes
c) Only a few
d) Except one
View Answer
Explanation: Yes, it could explain all the laws of chemical combinations i.e. Law of Conservation of Mass, Law of Definite Proportions, Law of Multiple Proportions, Gay Lussac’s Law of Gaseous Volumes, and Avogadro’s Law.
9. They are no limitations to Dalton’s atomic theory.
a) True
b) False
View Answer
Explanation: There are limitations to Dalton’s atomic theory. Dalton’s atomic theory couldn’t explain the reason for combining atoms. He also couldn’t explain gaseous volumes, because as per his view, different elements have different mass but this isn’t true. This is explained by Gay lussac’s law.
10. All atoms of a given element have identical __________ including identical _________
a) Properties, mass
b) Weight, volume
c) Volume, properties
d) Temperature, pressure
View Answer
Explanation: According to Dalton’s Atomic Theory, All atoms of a given element have identical properties, including identical mass. The reason behind this is that they belong to the same element (here “they” is about atoms).
Sanfoundry Global Education & Learning Series – Chemistry – Class 11.
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