Tag: atomic theory of dalton

Questions Related to atomic theory of dalton

Dalton said that elements are distinguished from each other by :

chemistry atoms, molecules and radicals history of atomic model atomic theory of dalton daltons atomic theory

  1. the charge on their ions

  2. the density of their solid forms

  3. the weights of their atoms

  4. the shapes of their atoms

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Correct Option: C
Explanation:

Atoms of a given element are identical in size, mass and other properties, while atoms of different elements differ in size, mass and other properties.

Who was the first scientist which proposed that "Matter is made up of indivisible particles called atoms"?

chemistry atoms, molecules and radicals history of atomic model atomic theory of dalton daltons atomic theory

  1. Lavoiser

  2. Dalton

  3. Thomson

  4. Faraday

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Correct Option: B
Explanation:

Dalton Atomic theory postulates-

All matter is made up of atoms and atoms are indestructible cannot be created or destroyed so the total mass of reactants remains equal to the total mass of products.

Atoms of different elements combine in :

chemistry atoms, molecules and radicals history of atomic model atomic theory of dalton daltons atomic theory

  1. unequal ratios.

  2. prime number ratios.

  3. equal ratios.

  4. whole number ratios.

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Correct Option: D
Explanation:

When elements react, their atoms combine in simple, whole-number ratios.   By suggesting that compounds contained characteristic atom-to-atom ratios, Dalton effectively explained the law of definite proportions.

Dalton's atomic theory was not accepted fully :

chemistry atoms, molecules and radicals history of atomic model atomic theory of dalton daltons atomic theory

  1. when atoms combine It must be presumed to be a binary one, unless some cause appear to the contrary.

  2. when elements react, their atoms sometimes combine in more than one simple, whole-number ratio.

  3. elements are characterized by the mass of their atoms.

  4. None of the above

Show answer
Correct Option: A
Explanation:

According to Dalton, When atoms combine in only one ratio, ".. it must be presumed to be a binary one, unless some cause appear to the contrary". 

          There was no experimental evidence to support this postulate, and it lead him to mistakenly assume that the formula of water was OH and the formula of ammonia was NH. As a result, Dalton's atomic weights for oxygen and nitrogen were incorrect and his experimental data did not support many of the conclusions he drew from it.

Which of the following is a merit of Dalton's atomic theory?

chemistry atoms, molecules and radicals history of atomic model atomic theory of dalton daltons atomic theory

  1. Laws of chemical combination

  2. Distinction between the fundamental particle of an element (atom) and that of a compound (molecule)

  3. Both A and B

  4. None of the above

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Correct Option: C
Explanation:

 Dalton's theory explains the laws of chemical combination.  Dalton was the first person to recognize a workable difference between the fundamental particle of an element (atom) and that of a compound (molecule).

Among the following, which one can not be further broken down by chemical means?

chemistry atoms, molecules and radicals history of atomic model atomic theory of dalton daltons atomic theory

  1. Cation

  2. Inert Gas

  3. Crystal

  4. Anion

  5. Element

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Correct Option: E
Explanation:

An element can not be further broken down by chemical means.


An element is defined as a substance that cannot be decomposed by a simple chemical process into two or more different substances. 

Some of the examples of elements are gold, silver copper, carbon, sulphur and phosphorous.

Hence option E is correct.

Which one proposes the basic postulates concerning elements and atoms?

chemistry atoms, molecules and radicals history of atomic model atomic theory of dalton daltons atomic theory

  1. Avogadro's number

  2. $P _1V _1=P _2V _2$

  3. $V _1T _2=V _2T _1$

  4. Dalton's theory

  5. Gay-Lussac's Law

Show answer
Correct Option: D
Explanation:

Dalton's theory proposes the basic postulates concerning elements and atoms.


All matter is made of atoms. Atoms are indivisible and indestructible. 

All atoms of a given element are identical in mass and properties.  

  Hence, the correct option is D.

Which of the following is not part of the Atomic Theory?

chemistry atoms, molecules and radicals history of atomic model atomic theory of dalton daltons atomic theory

  1. Compounds are made up of combinations of atoms

  2. All atoms of a given element are alike

  3. All matter is composed of atoms

  4. A chemical reaction involves the rearrangement of atoms

  5. The atom is mainly empty space

Show answer
Correct Option: E
Explanation:

Main Postulates of Dalton's Atomic Theory
1) All matter is made of atoms. Atoms are indivisible and indestructible.
2) All atoms of a given element are identical in mass and properties
3) Compounds are formed by a combination of two or more different kinds of atoms.
4) A chemical reaction is a rearrangement of atoms

option E is not a part of Atomic theory.

An important postulate of Dalton's atomic theory is: 

chemistry atoms, molecules and radicals history of atomic model atomic theory of dalton daltons atomic theory

  1. an atom contains electrons, protons and neutrons

  2. atom can neither be created nor destroyed nor divisible

  3. all the atoms of an element are not identical

  4. all the elements are available in nature in the form of atoms

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Correct Option: B
Explanation:

According to Dalton's theory, atoms can neither be created nor be destroyed.

The nucleus of the atom $\left( Z>1 \right) $ consists of:

chemistry inside the atom history of atomic model atomic theory of dalton daltons atomic theory

  1. Proton and neutron.

  2. Proton and electron.

  3. Neutron and electron.

  4. Proton, neutron and electrons

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Correct Option: A
Explanation:

The atomic nucleus is the central area of the atom. It is composed of two kinds of subatomic particles: protons and neutrons.The protons and neutrons held together to form the dense area of the nucleus.

For atoms havng $Z>1$ nucleus contains protons and neutrons.