Tag: atoms, molecules and radicals

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Questions Related to atoms, molecules and radicals

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

Which of the following is not a postulate of Dalton's atomic theory?

  1. All matter is made of very tiny particles called atoms

  2. Atoms of a given element are not identical in mass and chemical properties

  3. Atoms combine in a ratio of small whole numbers to form compounds

  4. The relative number and kinds of atoms are constant in a given compound
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The postulates of Dalton"s atomic theory may be stated as follows:
(i) All matter is made of very tiny particles called atoms.
(ii) Atoms of a given element are identical in mass and chemical properties.
(iii) Atoms of different elements have different masses and chemical properties.
(iv) Atoms combine in the ratio of small whole numbers to form compounds.
(v) The relative number and kinds of atoms are constant in a given compound.


So Atoms of a given element are not identical in mass or chemical properties.
This is not a Postulate of atomic theory.

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

John Dalton proposed which theory?

  1. Theory of molecules

  2. Atomic mass theory

  3. Theory of atoms

  4. Law of conservation of substances
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

John Dalton 1808, believed that matter is made up of extremely minute indivisible particles, called atoms which takes part in chemical reactions. These particle can neither be created nor be destroyed.

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

What are the merits of Dalton's atomic theory?

  1. Explains laws of chemical combination

  2. Distinguishes between fundamental particles of element

  3. Both A and B

  4. Proves individuality
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The atomic theory explains the laws of chemical combination (the Law of Constant Composition and the Law of Multiple Proportions) Dalton was the first person to recognize a workable distinction between the fundamental particle of an element (atom) and that of a compound (molecule).

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

If combining atoms of a compound have nearly similar electronegativities the bond between them is_____

  1. electrovalent

  2. covalent

  3. metallic

  4. ionic
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms.
So, combining atoms of a compound have nearly similar electronegativities the bond between them is covalent.

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

The existence of isotopes violated which one of the postulates of Dalton's atomic theory?

  1. All matter is made of very tiny particles called atoms

  2. Atoms of a given element are identical in mass and chemical properties

  3. Atoms are indivisible particles and cannot be created nor destroyed

  4. Atoms of same elements are alike in all respects
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Isotopes are atoms of same elements having same atomic number but different atomic masses.

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

Which postulates of Dalton's atomic theory can explain the Law of definite proportion?

  1. All matter is made of very tiny particles called atoms.

  2. Atoms of a given element are identical in mass and chemical properties.

  3. Atoms are indivisible particles and cannot be created nor destroyed.

  4. The relative number and kind of atoms in a given compound remain constant.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The law of definite proportion states that in compounds , the elements are always present in definite proportions by mass.