Class 9 Science MCQ Atoms and Molecules

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NCERT Class 9 Science MCQ Atoms and Molecules with Answers

Question :Who coined the term ‘Parmanu’ for the smallest indivisible particles?
(a) Leucippus
(b) L. Lavoisier
(c) Kanad
(d) None of them

Show Answer :

Answer : (c) Kanad

Question :The radius of a hydrogen atom is:
(a) 10^-2
(b) 10^-4
(c) 10^-9
(d) 10^-10

Show Answer :

Answer : (d) 10^-10

Question :The most remarkable concept that Dalton’s atomic theory proposed was that of the:
(a) atomic weight
(b) atomic mass
(c) molar mass
(d) none of them

Show Answer :

Answer : (b) atomic mass

Question :The atomic mass of carbon is:
(a) 12
(b) 14
(c) 16
(d) 23

Show Answer :

Answer : (a) 12

Question :Compounds composed of metals and non-metals contain:
(a) non-charged species
(b) charged species
(c) both of them
(d) none of them

Show Answer :

Answer : (b) charged species

Question :The formula of ammonium sulphate is:
(a) NHSO₄
(b) NH₄SO₂
(c) NHSO₃
(d) (NH₄)₂SO₄

Show Answer :

Answer : (d) (NH₄)₂SO₄

Question :The word “mole” was introduced around 1896 by:
(a) Wilhelm Ostwald
(b) John Dalton
(c) Avogadro
(d) Vergilious

Show Answer :

Answer : (a) Wilhem Ostwald

Question :The chemical symbol for sodium is:
(a) So
(b) Sd
(c) NA
(d) Na

Show Answer :

Answer : (d) Na

Question :Which of the following has a maximum number of atoms?
(a) 18 g of H₂O
(b) 18 g of O₂
(c) 18 g of CO₂
(d) 18 g of CH₄

Show Answer :

Answer : (d) 18 g of CH₄

Question :Which of the following contains a maximum number of molecules?
(a) 1g CO₂
(b) 1g N₂
(c) 1g H₂
(d) 1g CH₄

Show Answer :

Answer : (c) 1g H₂

Question : The radius of a hydrogen atom is:
(a) 10^-2
(b) 10^-4
(c) 10^-9
(d) 10^-10

Show Answer :

Answer :(d)

Question : Which of the following is correct pair of elements and its symbol?
(a) Silver – Si
(b) Sodium – So
(c) Potassium – Pt
(d) Sulphur – S

Show Answer :

Answer :(d) Sulphur – S

Question : The chemical symbol for sodium is
(a) So
(b) Sd
(c) NA
(d) Na

Show Answer :

Answer :(d) Na

Question : 1 u or 1 amu means
(a) 1/12th mass of C-12 atoms
(b) Mass of C-12 atom
(c) Mass of O-16 atom
(d) Mass of Hydrogen molecule

Show Answer :

Answer :(a) 1/12th mass of C-12 atoms

Question : The atomic mass of carbon is:
(a) 12
(b) 14
(c) 16
(d) 23

Show Answer :

Answer :(a) 12

Question : How many moles are present in 40 g of He?
(a) 10 moles
(b) 11 moles
(c) 13 moles
(d) 12 moles

Show Answer :

Answer :(a) 10 moles

Question : 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 CO₄

Show Answer :

Answer :(d)

Question : A sample of NH3 molecule irrespective of source contains 82.35% Nitrogen and 17.65% of Hydrogen by mass. This data supports:
(a) Law of Conservation of Mass
(b) Las of Multiple Proportions
(c) Law of Definite Proportions
(d) Avogadro’s Law

Show Answer :

Answer :(c) Law of Definite Proportions

Question : The word “mole” was introduced around 1896 by:
(a) Wilhelm Ostwald
(b) John Dalton
(c) Avogadro
(d) Vergilious

Show Answer :

Answer :(a) Wilhem Ostwald

Question : Which of the following is the major drawback of Dalton’s atomic theory?
(a) Atoms of an element have exactly the same mass.
(b) Atoms are indivisible.
(c) Atoms of different elements have different masses.
(d) All of the above

Show Answer :

Answer :(b) Atoms are indivisible.

Question : 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

Show Answer :

Answer :(c) when energy is either given to, or taken out from the system

Question : 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 ×10²³
(b) 6.09 ×10²²
(c) 6.022 ×10²³
(d) 6.022 ×10²¹

Show Answer :

Answer :(i)

Question : Which of the following has a maximum number of atoms?
(a) 18 g of H₂O
(b) 18 g of O₂
(c) 18 g of CO₂
(d) 18 g of CH₄

Show Answer :

Answer :(d)

Question : 9 grams of water decompose to give:
(a) 4g oxygen and 16g hydrogen
(b) 2g hydrogen and 1g oxygen
(c) 8g oxygen and 1g hydrogen
(d) none

Show Answer :

Answer :(c) 8g oxygen and 1g hydrogen

Question : The relative molecular mass of Na₂S₂O₃.5H₂O is
(a) 250 amu
(b) 250 g
(c) 248 amu
(d) 248 g

Show Answer :

Answer :(c) 248 amu

Question : The atomic mass of sodium is 23. The number of moles in 46g of sodium is
(a) 4
(b) 2
(c) 0
(d) ½

Show Answer :

Answer :(b) 2

Question : Who coined the term ‘Parmanu’ for the smallest indivisible particles?
(a) Leucippus
(b) L. Lavoisier
(c) Kanad
(d) None of them

Show Answer :

Answer :(c) Kanad

Question : What is the mass of 0.5 mole of Hydrogen atom
(a) 2.0 g
(b) 1.5 g
(c) 1 g
(d) 0.5 g

Show Answer :

Answer :(d) 0.5 g

Question : Percentage of calcium in calcium carbonate is
(a) 40
(b) 30
(c) 48
(d) 36

Show Answer :

Answer :(a) 40

Question : What is the formula mass unit of ZnO?
(a) 18 u
(b) 81 u
(c) 88 u
(d) 188 u

Show Answer :

Answer :(b) 81 u

Question : Calculate the formula unit mass of ZnCl₂?
(a) 137 u
(b) 124 u
(c) 123 u
(d) 111 u

Show Answer :

Answer :(a) 137 u

Question : How many times an atom of sulphur is heavier than an atom of carbon?
(a) 32 times
(b) 12 times
(c) 8/3 times
(d) 12/32 times

Show Answer :

Answer :(c) 8/3 times

Question : What is the number of moles present in 62 g of P₄molecules?
(a) 0.25 moles
(b) 0.5 moles
(c) 1 mole
(d) 2 moles

Show Answer :

Answer :B

Question : What mass of calcium contains the same number of atoms as present in 2.3 g of sodium?
(a) 40 g
(b) 13.8 g
(c) 9.2 g
(d) 4 g

Show Answer :

Answer 😀

Question : Barium chloride reacts with sulphuric acid according to the following reaction:
BaCl₂+ H₂SO₄→ BaSO₄+ 2HCl
The masses of BaCl₂and H₂SO₄solutions used were 6.3 g and 8.7 g respectively. If the mass of HCl formed was 5.8g, what would be the mass of BaSO₄formed?
(a) 9.2 g
(b) 10.2 g
(c) 10.8 g
(d) 11.2 g

Show Answer :

Answer :A

Question : Calcium carbonate on heating forms calcium oxide and carbon dioxide. If 25 g of CaCO₃on heating formed 14 g of CaO, calculate the amount of CO₂that escaped into the air.
(a) 22 g
(b) 14 g
(c) 11 g
(d) 5.5 g

Show Answer :

Answer :C

Question : What is the mass of 3.011 × 10²³atoms of hydrogen?
(a) 2 g
(b) 1 g
(c) 0.5 g
(d) 0.25 g

Show Answer :

Answer :C

Question : Calculate the mass of 0.25 moles of Cl₂gas.
(a) 284 g
(b) 71 g
(c) 35.5 g
(d) 17.75 g

Show Answer :

Answer 😀

Question : What is the Latin name for sodium?
(a) Ferrum
(b) Kalium
(c) Cuprum
(d) Natrium

Show Answer :

Answer 😀

Question : One atomic mass unit is equal to
(a) 1/16th of the mass of an O-16 atom.
(b) 1/17th of the mass of an O-17 atom.
(c) 1/12th of the mass of a C-12 atom.
(d) 1/13th of the mass of a C-13 atom.

Show Answer :

Answer :C

Question : The ion is a monoatomic ion.
(a) sulphate
(b) ammonium
(c) calcium
(d) carbonate

Show Answer :

Answer :C

Question : Which of the following is a polyatomic ion?
(a) Sulphide
(b) Chloride
(c) Nitride
(d) Nitrate

Show Answer :

Answer 😀

Question : 1.08 g of a sample of a compound of nitrogen and oxygen on analysis gave 0.28 g of nitrogen and 0.80 g of oxygen. What is the percentage of nitrogen present in this compound?
(a) 74.07 %
(b) 35 %
(c) 25.93 %
(d) 15 %

Show Answer :

Answer :C

Question : What is the value of Avogadro’s constant?
(a) 1.66 × 10^–24
(b) 9.1 × 10^–31
(c) 6.022 × 10²⁰
(d) 6.022 × 10²³

Show Answer :

Answer 😀

Question : The ratio by mass of hydrogen and chlorine in hydrogen chloride is
(a) 3 : 35.5.
(b) 35.5 : 3.
(c) 1 : 35.5.
(d) 35.5 : 1.

Show Answer :

Answer :C

Question : Hydrazine is a compound of nitrogen and hydrogen. The ratio by mass of nitrogen and hydrogen in this compound is 7 : 1. If the mass of hydrogen in hydrazine is 4 g, what is the mass of nitrogen?
(a) 7 g
(b) 11 g
(c) 28 g
(d) 56 g

Show Answer :

Answer :C

Question : According to the , during a chemical reaction, mass can neither be created nor be destroyed.
(a) law of conservation of mass
(b) law of constant proportions
(c) law of multiple proportions
(d) law of combining volumes

Show Answer :

Answer :A

Question : The ratio of hydrogen and oxygen in a sample of water collected from a well was found to be 1 : 8 by mass. When a sample of water was collected from a pond and analysed, the ratio of hydrogen and oxygen in it was also found to be 1 : 8 by mass. This data is in accordance with the
(a) law of conservation of mass.
(b) law of constant proportions.
(c) law of multiple proportions.
(d) law of combining volumes.

Show Answer :

Answer :B

Question : What is the chemical formula of magnesium phosphate?
(a) Mg₂(PO₄)₃
(b) Mg₃(PO₄)₂
(c) Mg₃(PO₄)
(d) Mg(PO₄)₂

Show Answer :

Answer :B

Question : The chemical compound of sodium hydrogen carbonate is
(a) NaHCO₃.
(b) Na₂HCO₃.
(c) NaCO₃.
(d) Na₂CO₃.

Show Answer :

Answer :A

Question : Name the smallest particle of an element or a compound which can exist independently and shows the properties of that substance.
(a) Atom
(b) Molecule
(c) Anion
(d) Cation

Show Answer :

Answer :B

Question : What is the atomicity of a phosphorus molecule?
(a) Two
(b) Three
(c) Four
(d) Eight

Show Answer :

Answer :C

Question : Which of the following compounds has the chemical formula ZnSO₃?
(a) Zinc sulphite
(b) Zinc sulphide
(c) Zinc sulphate
(d) Zinc hydrogen sulphate

Show Answer :

Answer :A

Question : Calculate the mass percentage of carbon in methane (CH₄).
(a) 75 %
(b) 33.3 %
(c) 25 %
(d) 20 %

Show Answer :

Answer :A

Question : What is the number of atoms of oxygen present in 0.5 moles of O₂?
(a) 6.022 × 10²³
(b) 3.011 × 10²³
(c) 6.022 × 10²⁰
(d) 3.011 × 10²⁰

Show Answer :

Answer :A

Question : mole(s) of Br₂contain 6.022 × 10²³atoms of bromine.
(a) 2
(b) 1
(c) 0.5
(d) 0.25

Show Answer :

Answer :C

Question : Which of the following is a monoatomic element?
(a) Fluorine
(b) Sulphur
(c) Argon
(d) Ozone

Show Answer :

Answer :C

Question : is an ionic compound.
(a) CCl₄
(b) H₂S
(c) N₂O₅
(d) K₂SO₄

Show Answer :

Answer 😀

Question : The chemical formula of ethanol is C₂H₅OH. Calculate its molecular mass.
(a) 34 u
(b) 38 u
(c) 46 u
(d) 52 u

Show Answer :

Answer :C

Question : Calculate the formula unit mass of MgCl₂.
(a) 46 g
(b) 59.5 g
(c) 83 gd
(d) 95 g

Show Answer :

Answer 😀

Fill in the Blanks.

Question :In a compound such as water, the ratio of the mass of hydrogen to the mass of oxygen is always ______

Show Answer :

Answer : 1 : 8

Question :Atomic radius is measured in ________

Show Answer :

Answer : nanometre

Question :The symbol of iron is Fe from its Latin name _________

Show Answer :

Answer : Ferrum

Question :One atomic mass unit is a mass unit equal to exactly ________ the mass of one atom of carbon-12.

Show Answer :

Answer : $\frac{1}{12}$ th

Question :The formula unit mass of a substance is a sum of the atomic ______ of all its constituent atoms.

Show Answer :

Answer : masses

Question :Avogadro number is represented by ________

Show Answer :

Answer : N₀

Question :The relative mass of atoms of all elements is obtained by comparing them with the mass of a _______ atom.

Show Answer :

Answer : Carbon-12

Question :The Avogadro constant 6.022 × 10²³ is defined as the number of atoms in exactly ______ of carbon-12.

Show Answer :

Answer : 12 g

True/False.

Question :An atom is the smallest particle of the element that cannot usually exist independently and retains all its chemical properties.

Show Answer :

Answer : True

Question :The Law of conservation of mass states that mass can neither be created nor destroyed in a chemical reaction.

Show Answer :

Answer : True

Question :The mass of 1 mole of a substance is equal to its relative atomic or molecular mass in grams.

Show Answer :

Answer : True

Question :16u oxygen has 16 atoms of oxygen.

Show Answer :

Answer : False

Question :The atomic mass of calcium is 40.

Show Answer :

Answer : True

Question :Aluminium is diatomic.

Show Answer :

Answer : False

CBSE Class 9 Science MCQ Is Matter Around Us Pure with Answers

NCERT Solutions & Download NCERT Textbooks

Chapter 1 : Matter in Our Surroundings

Chapter 2 : Is Matter Around Us Pure

Chapter 3 : Atoms and Molecules

Chapter 4 : Structure of Atom

Chapter 5 : The Fundamental Unit of Life

Chapter 6 : Tissues

Chapter 7 : Diversity in Living Organisms

Chapter 8 : Motion

Chapter 9 : Force and Laws of Motion

Chapter 10 : Gravitation

Chapter 11 : Work, Power And Energy

Chapter 12 : Sound

Chapter 13 : Why Do we Fall Ill

Chapter 14 : Natural Resources

Chapter 15 : Improvement in Food Resources

Class 9 Science MCQ Atoms and Molecules

NCERT Class 9 Science MCQ Atoms and Molecules with Answers

CBSE Class 9 Science MCQ Is Matter Around Us Pure with Answers

CBSE Class 9 Science MCQ Matter in Our Surroundings with Answers

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Class 9 Science MCQ Atoms and Molecules

NCERT Class 9 Science MCQ Atoms and Molecules with Answers

CBSE Class 9 Science MCQ Is Matter Around Us Pure with Answers

CBSE Class 9 Science MCQ Matter in Our Surroundings with Answers

MCQ Questions Electrical Engineering Series Parallel Circuit

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