Atoms and Molecules MCQ Questions Class 9 Science Chapter 3
NCERT MCQ Questions for Class 9 Science Chapter 3 Atoms and Molecules. Atoms and Molecules MCQ Questions with Answers from Class 9 Science Chemistry.
Atoms and Molecules MCQ Questions Class 9 Science Chapter 3
Atoms and Molecules Multiple Choice Questions with Answers Class 9 Science Chapter 3 PDF is available.
1.) Choose the law of conservation of mass
a) Mass neither be created nor formed
b) Mass can neither be created nor reform
c) Mass can neither be created nor destroyed
d) Mass can neither be created nor alive
ANS-Mass can neither be created nor destroyed
2.) Energy can neither be created nor destroyed. it is a………………
a) Energy recreation
b) Energy is cannot reform
c) Law of conservation of energy
d) Law of conservation
ANS-Law of conservation of energy
3.) In ammonia , nitrogen and hydrogen is in ratio ………….. by mass.
a) 14:5
b) 14:3
c) 14:8
d) 14:2
ANS-14:8
4.) Choose incorrect sentence
a) Energy can neither be created nor destroy
b) In chemical substance elements present in definite proportion
c) Ammonia molecule made by hydrogen and oxygen
d) Water have not any particular texture
ANS-Ammonia molecule made by hydrogen and oxygen
5.) Smallest particle of matter called……….
a) Tiny particle
b) Tiny molecule
c) Molecule
d) Atom
ANS-Atom
6.) Atomic radius is measured in…………
a) Kg
b) cm
c) Mm
d) nm
ANS- nm
7.) 1nm means how many meters?
a) 1/109 m
b) 1/108 m
c) 1/10-9 m
d) 1/10-8 m
ANS-1/109 m
8.) 1 meter means how many nanometers?
a) 109
b) 108
c) 107
d) 105
ANS-109
9.) …………….. for some elements as proposed by Dalton.
a) Shape
b) Initiator
c) Symbol
d) Color
ANS-Symbol
10.) An international scientific organization which approves names of elements, symbol and unit called …………….
a) Periodic table
b) IUPAC nomenclature
c) Name system
d) None of the above
ANS-IUPAC nomenclature
11.) Choose incorrect option
a) AL is the symbol of aluminium
b) Ag is the symbol of silver
c) Au is the symbol of gold
d) All of the above
ANS-AL is the symbol of aluminium
12.) Symbol of copper
a) Co
b) C
c) Coo
d) Cu
ANS-Cu
13.) Symbol of iron
a) I
b) Ir
c) Fe
d) Fi
ANS-Fe
14.) Symbol of sodium
a) Na
b) So
c) S
d) No
ANS-Na
15.) Choose the correct option
a) Na is a symbol of nitrogen
b) Proton contain positive charge
c) Electron is present in nucleus
d) Su is the symbol of sulphur
ANS-Proton contain positive charge
16.) How to calculate molecular mass.
a) Sum of proton number and electron number
b) Multiplication of proton number and electron number
c) Sum of proton number and neutron number
d) Multiplication of proton number and neutron number
ANS-Sum of proton number and neutron number
17.) Atomic number means?
a) Number of electron
b) Number of proton
c) Number of neutron
d) None of the above
ANS-Number of proton
18.) ‘ amu’ is abbreviation of ………….. unit
a) Weight
b) Mass
c) Volume
d) Molecule
ANS-Mass
19.) Symbol of neon
a) N
b) Ni
c) Ne
d) None of the above
ANS-Ne
20.) Group of two or more atoms called………..
a) Elements
b) Molecules
c) Complex
d) None of the above
ANS-Molecule
21.) Which atoms exist by only one atom of that element.
a) Gaseous
b) Metals
c) Nonmetals
d) Noble gas
ANS-Noble gas
22.) Formula of ozone
a)O2
b) O3
c) OH
d) H2
ANS- O3
23.) The number of atoms constituting a molecule is known as its……………
a) Molecular weight
b) Atomic number
c) Atomicity
d) Molecule
ANS- Atomicity
24.) Atomicity of argon…………
a) Diatomic
b) Atomic
c) Polyatomic
d) Monoatomic
ANS- Monoatomic
25.) Charged species is known as…………
a) Electric current
b) Anions
c) Ions
d) Current
ANS-Ions
In case you are missed :- Previous Chapter MCQ Questions
26.) Negatively charged ions called…………..
a) Electric current
b) Anions
c) Ions
d) Current
ANS-Anions
27.) Positively charged ions called…………
a) Ions
b) Anions
c) Cations
d) Positron
ANS-Cations
28.) NaCl means?
a) Sodium calcium
b) Sodium chloride
c) Nitrogen chloride
d) Nitrogen calcium
ANS-Sodium chloride
29.) Choose correct a correct option
a) Na+
b) K-
c) Cl+
d) H-
ANS-Na+
30.) Which is the polyatomic ions from below option
a) Hydrogen
b) Oxygen
c) Argon
d) Ammonium
ANS-Ammonium
31.) Combining power of an element known as its………………….
a) Valency
b) Atomicity
c) Molecularity
d) None of the above
ANS-Valency
32.) Choose a correctly written molecule
a) OH2
b) OC
c) OCa
d) Mg(OH)2
ANS-Mg(OH)2
33.) Compounds which are made up of two different elements called………………… compounds
a) Elemental
b) Molecular
c) Polyatomic
d) Binary
ANS-Binary
34.) …………… is not binary compound
a) Hydrogen chloride
b) Hydrogen sulphide
c) Magnesium chloride
d) None of the above
ANS-None of the above
35.) Formula of magnesium chloride
a) MgCl
b) MgClO
c) MgCl2
d) None of the above
ANS-MgCl2
36.) ………… is a cationic species in magnesium chloride
a) Mg
b) Mg+1
c) Cl-
d) Mg+2
ANS- Mg+2
37.) Formula of Aluminium oxide
a) AlO
b) AlO2
c) Al2O3
d) Al3O2
ANS- Al2O3
38.) Name of that compound NaNO3
a) Sodium nitrogen oxide
b) Sodium nitroxide
c) Sodium nitrite
d) Sodium nitrate
ANS-Sodium nitrate
39.) Calculate the molecular mass of Ozone
a) 16
b) 48
c) 98
d) 52
ANS- 48
40.) Calculate the molecular weight of carbon dioxide
a) 16
b) 32
c) 44
d) 40
ANS- 44
41.) Neutron present in……………..
a) Atom
b) Nucleus of atom
c) Periphery of atom
d) Not exist in atom
ANS- Nucleus of atom
42.) 1 gross means…………….nos
a) 12
b) 122
c) 24
d) 144
ANS-144
43.) 4 moles of element having atomic mass 4 so find the amount of element in gram?
a) 8
b) 12
c) 16
d) 20
ANS-16
44.) Atomic number of calcium
a) 5
b) 18
c) 20
d) 22
ANS-20
45.) NA is symbol of……………….
a) Atomic mass
b) Atomic unit
c) Avogadro number
d) Einstein number
ANS-Avogadro number
46.) 1 mole is ………………………..
a) 6.022 * 1022
b) 6.022 * 1023
c) 6.028 * 1022
d) 6.028 * 1023
ANS-6.022 * 1023
47.) …………………..No. of protons present in nitrogen
a) 6
b) 14
c) 7
d) 20
ANS-7
48.) Number of neutron present in oxygen molecule
a) 8
b) 5
c) 4
d) 6
ANS-8
49.) Valency of carbon
a) 2
b) 4
c) 8
d) 7
ANS-4
50.) Calculate the molecular weight of Cl2
a) 35
b) 34
c) 70
d) 68
ANS-70
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