Table of Contents
ATOMS AND MOLECULES CLASS 9 MCQ WITH ANSWERS CBSE TERM II PREPARATION
DOWNLOAD MOBILE APPLICATION TO LEARN MORE: ATOMS AND MOLECULES CLASS 9 MCQ WITH ANSWERS
11.What is the symbol of helium?
a)Na
b)He
c)Al
d)Co
Ans. He
12.Which of the following statement is not true about an atom?
a)Atoms are not able to exist independently.
b)Atoms are the basic units from which molecules and ions are formed.
c)Atoms are always neutral in nature.
d)Atoms aggregate in large numbers to form the matter that we can see, feel or touch.
Ans. Atoms are not able exist independently
13.he chemical symbol for nitrogen gas is:
a)Ni
b)N2
c)N+
d)N
Ans. N2
14.The chemical symbol for sodium is:
a)So
b)Sd
c)NA
d)Na
Ans. Na
15.Which of the following would weigh the highest?
a)0.2 mole sucrose (C12H22O11)
b)2 mole of CO2
c)2 moles of CaCO3
d)10 moles of H2O
Ans.2 moles of CO2
DOWNLOAD MOBILE APPLICATION TO LEARN MORE: ATOMS AND MOLECULES CLASS 9 MCQ WITH ANSWERS
16.Which of the following has maximum number of atoms?
a)18 g of H2O
b)18 g of O2
c)18 g of CO2
d)18 g of CH4
Ans. 18 g of CH4
17.Which of the following contains maximum number of molecules?
a)1 g CO2
b)1g N2
c)1 g H2
d)1 g CH4
Ans. 1 g CO2
18.Mass of one atom of oxygen is:
a)16 / 6.023 x 1023 g
b)32 / 6.023 x 1023 g
c)1 / 6.023 x 1023 g
d)8 u
Ans. 16 / 6.023 x 1023g
19.3.42 g of sucrose are dissolved in 18 g of water in a beaker. The numbers of oxygen atoms in the solution are:
a)6.68 x 1023
b)6.09 x 1022
c)6.022 x 1023
d)6.022 x 1021
Ans.6.68 x 1023
20.A change in the physical state can be brought about:
a)Only when energy is given to the system
b)Only when energy is taken out from the system
c)When energy is either given to, or taken out from the system
d)Without any energy change
Ans. When energy is either given to, or taken out from the system
DOWNLOAD MOBILE APPLICATION TO LEARN MORE: ATOMS AND MOLECULES CLASS 9 MCQ WITH ANSWERS
21.What is ratio by mass of the combining elements in CaCO3?
a)10 : 3 : 12
b)11 : 4 : 13
c)12 : 5 : 15
d)14 : 6 : 17
Ans.10 : 3 : 12
22.What is the ratio by mass of the combining elements in MgCl2?
a)23 : 76
b)24 : 71
c)28 : 79
d)29 : 72
Ans.24 : 71
23.What is the ratio by mass of the combining elements in H2SO4?
a)2 : 17 : 35
b)3 : 18 : 36
c)4 : 19 : 38
d)1 : 16 : 32
Ans. 1 : 16 : 32
24.What is the ratio by mass of the combining elements in C2H5OH?
a)13 : 1 : 8
b)14 : 2 : 9
c)12 : 3 : 8
d)11 : 4 : 7
Ans. 12 : 3 : 8
25.What is the ratio by mass of the combining elements in NH3?
a)14 : 3
b)15 : 2
c)16 : 4
d)17 : 8
Ans. 14 : 3
DOWNLOAD MOBILE APPLICATION TO LEARN MORE: ATOMS AND MOLECULES CLASS 9 MCQ WITH ANSWERS
26.What is the ratio by mass of the combining elements in Ca(OH)2?
a)20 : 16 : 1
b)21 : 17 : 4
c)23 : 19 : 5
d)24 : 15 : 3
Ans. 20 : 16 : 1
27.A sample of vitamin C is known to contain 2.58 x 1024 oxygen atoms. How many moles of oxygen are present in the sample?
a)3.24 moles
b)4.28 moles
c)5.29 moles
d)2.27 moles
Ans.4.28 moles
28.The visible universe is estimated to contain 1022 stars. How many moles of stars are present in the visible universe?
a)0.0166 moles
b)0.0177 moles
c)0.0155 moles
d)0.0144 moles
Ans. 0.0166 moles
29.Compute the difference in masses of 103 moles each of magnesium atoms and magnesium ions. (Mass of an electron = 9.1*10 -31kg)
a)1.098 x 102kg
b)1.097 x 10-3 kg
c)1.099 x 10-4kg
d)1.095 x 10-1kg
Ans. 1.097 x 10-3 kg
30.A group of atoms carrying a fixed charge on them is called.
a)Molecules of methane
b)Law of conservation of mass
c)Polyatomic ion
d)Sodium carbonate
Ans. Law of conservation of mass
ALSO WATCH : GRAVITATION CLASS 9 CBSE
DOWNLOAD MOBILE APPLICATION TO LEARN MORE: ATOMS AND MOLECULES CLASS 9 MCQ WITH ANSWERS