Class IX, NCERT (CBSE) Chemistry | Chapter 3, Atoms and Molecules - Multiple Choice Questions

 Class 9, Solutions of NCERT (CBSE) Science 
 Chemistry - Atoms and Molecules  

 Multiple Choice Questions (MCQ) 

Q.1: Select the ionic compound -

(a) Sulphur molecule, S₈ (b) Phosphorous molecule, P₄

(c) Methane, CH₄ (d) Copper nitrate, Cu(NO₃)₂  

Q.2: Which of the following does not change when a chemical reaction takes place?

(a) volume (b) mass (c) physical properties (d) chemical properties

Q.3: One atomic mass unit is equal to weight of -

(a) one atom of hydrogen (b) 1/16th of oxygen atom

(c) 1/12th of natural carbon atom (d) 1/12th of C-12 isotope of carbon.   

Q.8: Which one of the following is not equal to gram molecular mass of hydrogen -

(a) 2 gm (b) 6.022 x 10²³ atoms of hydrogen

(c) 6.022 x 10²³ molecules of hydrogen (d) 1 mole of hydrogen.  

Q.9: Which of the following does not represent molar mass of a substance?

(a) 1 mole of HCl (b) 6.022 x 10²³ molecules of helium

(c) 16 gm of O₂ (d) 44 gm of CO₂  

Q.10: Formula mass is not used in case of -

(a) NaCl (b) MgCl₂ (c) CCl₄ (d) CaO

Q.14: How many atoms does one mole of S₈ contain?

(a) 6.023 x 10²³ (b) 96 (c) 8 x 6.023 x 10²³ (d) 1

Q.15: Molecules without a charged valency are contained by only -

(a) metals (b) non-metals (c) gases (d) none of these.  

Solutions: 1-d, 2-b, 3-d, 4-c, 5-a, 6-a, 7-a, 8-b, 9-c, 10-a, 11-b, 12-d, 13-a, 14-c, 15-b.

• CBSE Board Class 9, Atoms and Molecules, Chapter 3, NCERT Solutions of Science Textbook Exercise Questions Solved [Read] 
• Class 9, NCERT Solutions - CBSE Science (Chemistry): Chapter 3, Atoms and Molecules | Ncert Chapter In Text Questions [Read] 
• Class IX, NCERT (CBSE) | Chapter 3, Atoms and Molecules | Study Materials, Notes, Sample Questions [Read]