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