Atoms and Molecules Class 9 MCQ. We covered all the Atoms and Molecules Class 9 MCQ in this post for free so that you can practice well for the exam.
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Atoms and Molecules Class 9 Objective MCQ for Students
Which of the following is/are correct for the law of constant proportion? 1. It was given and stated by Lavoisier. 2. In a chemical substance, the elements are always present in definite proportions by mass.
(a) Only 1
(b) Only 2
(c) Both 1 and 2
(d) Neither 1 nor 2
Option b – Only 2
Which of the following is/are true for Dalton’s atomic theory? 1. All matter is made of tiny up very particles called atoms. 2. Atoms do not participate in chemical reactions. 3. Atoms are indivisible particles.
(a) 1 and 2
(b) 2 and 3
(c) 1 and 3
(d) 1, 2, and 3
Option c – 1 and 3
Which of the following is/are correct for molecules? 1. It is a group of two or more atoms that are chemically bonded together. 2. Atoms of only the same element join to form molecules.
(a) Only 1
(b) Only 2
(c) Both 1 and 2
(d) Neither 1 nor 2
Option a – Only 1
Which of the following are correctly matched? 1. Argon – monoatomic 2. Phosphorus – polyatomic 3. Chlorine – diatomic
(a) 1 and 2
(b) 2 and 3
(c) 1 and 3
(d) 1, 2, and 3
Option c – 1 and 3
Which of the following is/are correct for ions? 1. The charged species are known as ions. 2. A negatively charged ion is called a cation. 3. A group of atoms carrying a charge is known as a polyatomic ion.
(a) 1 and 2
(b) 2 and 3
(c) 1 and 3
(d) 1, 2, and 3
Option c – 1 and 3
Which of the following is/are correct for atomic mass? 1. It was proposed by Bohr. 2. It was explained by the law of constant proportions.
(a) Only 1
(b) Only 2
(c) Both 1 and 2
(d) Neither 1 nor 2
Option b – Only 2
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