9th Class Chemistry MCQs

9th Class Chemistry MCQs with answers for grade 9 chemistry subject paper preparation online.

9th Class Chemistry MCQs

How many numbers of moles are equivalent to 8 grams of CO2?

(A) 0.15
(B) 0.18
(C) 0.21
(D) 0.24

Formula: No. of moles = Given mass/Molar mass

The number of particles in one mole of a substance is called:

(A) Atomic number
(B) Particle number
(C) Avogadro’s number
(D) Mass number

Which one of the followings shows the simplest whole number ratio of atoms in a substance?

(A) Molecular formula
(B) Empirical formula
(C) Chemical formula
(D) Covalent formula

An atom or group of atoms having odd number of electrons is called:

(A) Radical
(B) Ion
(C) Free radical
(D) Molecular ion

The unique property of an element is called:

(A) Electronegativity
(B) Valency
(C) Mobility
(D) Oxidation number

Which one of the followings has sharp and fixed melting point?

(A) Compound
(B) Mixture
(C) Both
(D) None of these

All of the followings are tri-atomic molecule except:

(A) H₂
(B) O₃
(C) H₂O
(D) CO₂

An atom or group of atoms having positive charge on it is called:

(A) Cation
(B) Anion
(C) Molecule
(D) Atom

One amu (atomic mass unit) is equivalent to:

(A) 1.66 × 10^-24 mg
(B) 1.66 ×10^–24g
(C) 1.66 × 10^–21g
(D) 1.66 × 10^–23g

It has the highest percentage in earth’s crust and oceans.

(A) calcium
(B) carbon
(C) oxygen
(D) nitrogen

The isotope C-12 is present in abundance of:

(A) 96.9 %
(B) 97.6 %
(C) 99.7 %
(D) none of these

Which one of the following is the most penetrating?

(A) protons
(B) electrons
(C) neutrons
(D) alpha particles

Protons were discovered by:

(A) Thomson
(B) Chadwick
(C) Moseley
(D) Goldstein

Which one of the following results in the discovery of proton

(A) cathode rays
(B) canal rays
(C) x-rays
(D) alpha rays

Plum pudding model was put forwarded by:

(A) Dalton
(B) Thomson
(C) Goldstein
(D) Chadwick

Neutron was discovered by

(A) Rutherford
(B) Chadwick
(C) Bohr
(D) William Crooks

Deuterium is used to make:

(A) light water
(B) heavy water
(C) soft water
(D) hard water

Atom of the same elements are

(A) Different
(B) Alike
(C) Comparable
(D) Active

Which of the following are fundamental particles of an atom?

(A) Ion
(B) Molecular ion
(C) Electron
(D) Positron

The highly penetrating rays are:

(A) Alpha particle
(B) Beta particle
(C) Neutron
(D) Both a & b

According to the modern periodic law, the properties of the elements are periodic function of their:

(A) Atomic number
(B) Number of electrons
(C) Mass number
(D) Number of valence electrons

4th and 5th period of the long form of Periodic Table are called:

(A) Short periods
(B) normal periods
(C) Long periods
(D) Very long periods

Salts of sodium give:

(A) Bluish green
(B) Red
(C) Yellow
(D) Green

Which element exists in liquid form at room temperature?

(A) Ba
(B) Br
(C) Be
(D) B

Mark the incorrect statement.

(A) 2nd period contains eight elements
(B) 3rd period contains eight elements
(C) 4th period contains 18 elements
(D) 7th period contains 23 elements only

Mendeleev Periodic Table was based upon the:

(A) Electronic configuration
(B) atomic mass
(C) Atomic number
(D) completion of a subshell

The ionization energy of sodium is:

(A) +495.8 kj/mol
(B) +594.8 kj/mol
(C) -495.8 kj/mol
(D) -594.8 kj/mol

ns² is the general electronic configuration of:

(A) Boron family
(B) Nitrogen family
(C) Alkali metals
(D) Alkaline earth metals

The atomic radii of the elements in Periodic Table:

(A) Increase from left to right in a period
(B) Increase from top to bottom in a group
(C) Do not change from left to right in a period
(D) Decrease from top to bottom in a group

Mark the incorrect statement about ionization energy:

(A) It is measured in kJmol^-1
(B) It is absorption of energy
(C) It decreases in a period
(D) It decreases ina group

After gaining one electron, chlorine atom attains the electronic configuration of which noble gas:

(A) Helium
(B) Neon
(C) Argon
(D) Krypton

Octet rule is:

(A) Description of eight electrons
(B) Picture of electronic configuration
(C) Pattern of electronic configuration
(D) Attaining of eight electrons

Considering the electronic configuration of atoms which atom with the given atomic number will be the most stable one?

(A) 6
(B) 8
(C) 10
(D) 12

How many electrons are involved in triple covalent bond:

(A) Six
(B) Only three
(C) Four
(D) Eight

Which type of force is present in hydrogen bonding:

(A) Inter molecular force
(B) Ionic force
(C) Covalent force
(D) Metallic force

Atoms react with each other because

(A) They attract each other
(B) They are short of electrons
(C) They want to attain stability
(D) They want to disperse

Covalent Bond involves the:

(A) Donation of electrons
(B) Acceptance of electrons
(C) Sharing of electrons
(D) Repulsion force of electrons

Which type of Covalent bond is present in nitrogen molecule:

(A) Single Covalent bond
(B) Double Covalent bond
(C) Triple Covalent bond
(D) Metallic bond

When an electronegative element combines with electropositive element the type of bonding is:

(A) Covalent
(B) Ionic
(C) Polar covalent
(D) Coordinate covalent

Addition of oxygen during chemical reaction is called:

(A) Reduction
(B) Oxidation
(C) Evaporation
(D) Conduction

Which of the following expand or compressed easily

(A) Liquid
(B) Gases
(C) Solids
(D) Water

Which one of the following gas diffuses faster?

(A) Hydrogen
(B) helium
(C) fluorine
(D) chlorine

V/T = K is the mathematical form of:

(A) Boyle’s law
(B) Charles law
(C) Avogadro law
(D) Dalton law

At freezing point which one of the following coexists in dynamic equilibrium:

(A) Gas and solid
(B) liquid and gas
(C) liquid and solid
(D) all of these.

Gases exerts pressure in all directions

(A) Uniformly
(B) Randomly
(C) Alternately
(D) Constantly

Mass per unit volume is called:

(A) Pressure
(B) Temperature
(C) Density
(D) Solubility

Solid particles possess which one of the following motions?

(A) Rotational motions
(B) vibrational motions
(C) Translational motions
(D) both translational and vibrational motions

Which one of the following is not amorphous?

(A) Rubber
(B) plastic
(C) glass
(D) glucose

Gases are the lightest form of matter and their densities are expressed in terms of:

(A) mg cm^–3
(B) g cm^–3
(C) g dm^–3
(D) kg dm^–3

In which unit density of gases is measures?

(A) kg mm^-3
(B) cm^-3
(C) gdm^-3
(D) gcm^-3

Which one of the following is a ‘liquid in solid’ solution?

(A) Sugar in water
(B) Opal
(C) Butter
(D) Fog

The solution which can easily pass through parchment membrane is considered as:

(A) Colloidal solution
(B) True solution
(C) Suspensions
(D) Crystalloids

Fog is an example of solution

(A) Gas in liquid
(B) Liquid in gas
(C) Liquid in solid
(D) Solid in liquid

A 5 percent (w/w) sugar solution means that:

(A) 5 g of sugar is dissolved in 90 g of water
(B) 5 g of sugar is dissolved in 100 g of water
(C) 5 g of sugar is dissolved in 105 g of water
(D) 5 g of sugar is dissolved in 95 g of water

Concentration is ratio of:

(A) Solvent to solute
(B) Solute to solution
(C) Solvent to solution
(D) Both ‘A’ and ‘B’

Which property is not for suspensions?

(A) Homogeneous
(B) Cannot be seen by naked eye
(C) Not a true solution
(D) Solid in liquid

The homogeneous mixture of two or more compounds is called:

(A) solute
(B) solvent
(C) solution
(D) fluid

Blood is an example of

(A) True solution
(B) Suspension
(C) Colloid
(D) None of all

The concentrated solution of NaCl is called:

(A) Fluid
(B) Brass
(C) Brine
(D) Plasma

Mist is an example of solution:

(A) Liquid in gas
(B) Gas in liquid
(C) Solid in gas
(D) Gas in solid

Rods through which electric current enters or leaves the cell:

(A) Protons
(B) electrons
(C) electrodes
(D) all of these

Electrode through which electrons enter the external circuit:

(A) Anode
(B) Cathode
(C) electrode
(D) none of these

Electrode through which electrons leave the external circuit:

(A) Anode
(B) Cathode
(C) graphite
(D) electrolyte

In the redox reaction between Zn and HCl, the oxidizing agent is:

(A) Zn
(B) H⁺
(C) Cl^–
(D) H

Formation of water from hydrogen and oxygen is:

(A) Redox reaction
(B) Acid-base reaction
(C) Neutralization
(D) Decomposition

Symbol of hydronium ion is:

(A) H⁺
(B) OH^–
(C) H₃O⁺
(D) none of these

During electrolysis _____ takes place at anode.

(A) Catenation
(B) oxidation
(C) reduction
(D) addition

Spontaneous chemical reactions take place in:

(A) Electrolytic cell
(B) Galvanic cell
(C) Nelson’s cell
(D) Down’s cell

Which is not the characteristic of electrolyte?

(A) Cheap
(B) conductor
(C) easily oxidized
(D) soluble in water

Which one of the following is not an electrolytic cell?

(A) Downs cell
(B) Galvanic cell
(C) Nelson’s cell
(D) Both a and c

The electronegative and non-metallic character from top to bottom

(A) increases
(B) decreases
(C) remain same
(D) stable

The alkaline earth metals are smaller in size and have more

(A) ionization energy
(B) electron affinity
(C) nuclear change
(D) electropositive

Sodium is extremely reactive metal, but it does not react with:

(A) Hydrogen
(B) Nitrogen
(C) Sulphur
(D) Phosphorus

Which one of the following is brittle?

(A) Sodium
(B) Aluminium
(C) Selenium
(D) Magnesium

Which metal is used for making mirrors?

(A) Lead
(B) Iron
(C) Silver
(D) Lithium

Which one the following is the lightest and floats on water:

(A) Calcium
(B) Magnesium
(C) Lithium
(D) Sodium

These are highly oxidizing agents

(A) alkali metals
(B) alkaline earth metals
(C) transition metals
(D) halogens

Chlorine has colour:

(A) pale yellow
(B) greenish yellow
(C) reddish brown
(D) purple black

Non-metalsare generally soft, but which one of the following is extremely hard?

(A) Graphite
(B) Phosphorus
(C) Iodine
(D) Diamond

The Molecule consist of two atoms is:

1. Monoatomic molecule
2. Polyatomic molecule
3. Hetero atomic molecule
4. Diatomic molecule

A formula that indicates actual number and type of atoms in a molecule is called?

1. Chemical formula
2. Empirical formula
3. Molecular formula
4. Formula mass

Ethyl alcohol was prepared by:

1. Ibne-Sina
2. Al-Razi
3. Al-Beruni
4. Jaber bin-Hayan

Which of the following is a homo atomic?

1. H2
2. NH3
3. H2O
4. CO2

The Empirical formula of hydrogen peroxide is:

1. H2O2
2. HO
3. OH
4. O2H2

A piece of matter in pure form is termed as:

1. Redical
2. Mixture
3. Compound
4. Substance

In an atom number of protons and neutrons are added to obtain:

1. Number of electrons
2. Number of nucleons
3. Atomic number of element
4. Number of isotopes

If proton number is 19, electron configuration will be:

1. 2, 8, 9
2. 2, 8, 8, 1
3. 2, 8, 1
4. 2, 8, 3

If nucleon number of potassium is 39, number of neutrons will be:

1. 39
2. 19
3. 20
4. 29

The isotope C-12 is present in abundance of:

1. 96.9%
2. 97.6%
3. 98.8%
4. 99.7%

Electronic configuration is distribution of:

1. Proton
2. Neutron
3. Electron
4. Positron

Which one of the following is most penetrating?

1. Electron
2. Proton
3. Alpha particle
4. Neutron

How many sub-shells in a L shell?

1. One
2. Two
3. Three
4. Four

De Broglie extend the wave particle duality to electron in:

1. 1920
2. 1922
3. 1923
4. 1925

Name the material of screen which used in Rutherford atomic model?

1. Aluminum foil
2. Zinc sulphide
3. Sodium sulphide
4. Aluminum sulphide

Which rays are used for sterilization of medical instruments?

1. α-rays
2. β-rays
3. γ-rays
4. x-rays

In 1869 Mandeleev put forward his periodic law about:

1. Atomic Number
2. Chemical properties
3. Physical properties
4. Atomic Mass

The periodic table divided into S, P, d, and f block based on:

1. Atomic Radius
2. Electronic Configuration
3. Ionization Energy
4. Electron Affinity

4th and 5th period in periodic table are known as?

1. Short period
2. Long period
3. Normal period
4. Very long period

Which one of the following decreases along the period?

1. Ionization Energy
2. Atomic Radius
3. Electronegativity
4. Electron Affinity

The elements of VIIA group are known as:

1. Lanthanides
2. Actinides
3. Halogens
4. Nobel Gases

According to Mosely the chemical properties of elements are the periodic function of their?

1. Atomic Size
2. Atomic Mass
3. Atomic Radius
4. Atomic Number

The shielding effect across the period:

1. Increases
2. Decrease
3. Moderate
4. Same

The ability to attract shared pair of electron is called:

1. Electron Affinity
2. Electronegativity
3. Ionization Energy
4. Shielding Effect

In group electron affinity values decreases from top to bottom because:

1. Atomic size normal
2. Atomic size increases
3. Atomic size decreases
4. Atomic size same

All Transition Elements are:

1. Gases
2. Metals
3. Nonmetals
4. Metalloids

An example of ionic compound is:

1. H
2. CH
3. N
4. NaCl

Two fluorine atoms share one electron each in their outermost shell to achieve electronic configuration of:

1. Xe
2. Ar
3. Kr
4. Ne

At room temperature most of ionic compounds are:

1. Amorphous solids
2. Crystalline solids
3. Liquids
4. Gases

Number of electrons lost by atoms of group IIIA equals:

1. 1
2. 2
3. 3
4. 4

Atom which loses two electrons from its outer shell to form ion is called?

1. Oxygen
2. Potassium
3. Magnesium
4. Carbon

In NaCl crystal lattice each Na ion is surrounded by:

1. 6 Cl^- ions
2. 6 Na^+ ions
3. 8 Cl^- ions
4. 12 Cl^- ions

Tendency of atoms to acquire eight electrons in their valence shell is:

1. Octet rule
2. Duplet rule
3. Triplet rule
4. None of above

Nobel gases are stable because they contain:

1. 4 electrons in valence shell
2. 6 electrons in valence shell
3. 8 electrons in valence shell
4. 10 electrons in valence shell

Bond which involve 3 shared electron pairs is a:

1. Double covalent bond
2. Single covalent bond
3. Triple covalent bond
4. None of above

A non-metal atom form anion by:

1. Loses of electrons
2. Gain of electrons
3. Loses of protons
4. Gain of protons

The molar mass of H2SO4 is:

1. 98 a.m.u
2. 9.8 gm
3. 98 gm
4. 9.8 a.m.u

When two identical atoms share electron pairs and exert force on each other than bond form is:

1. Non-polar covalent bond
2. Polar covalent bond
3. Double covalent bond
4. Coordinate covalent bond

Synthetic resins are used on places where:

1. Electric resistance is required
2. Water resistance is required
3. Adhesion is required
4. Friction is required

Oxygen belongs to group VIA so number of electrons in its valence shell are:

1. 3
2. 4
3. 5
4. 6

Electron pairs which are not shared by atoms are called?

1. Electron pairs
2. Lone pairs
3. Bond pairs
4. Shared pairs

Strength of intermolecular forces from ionic or covalent bond is:

1. Weaker
2. Stronger
3. Equal
4. None of above

Ionic crystals have:

1. High melting points
2. Moderate melting points
3. Low melting points
4. None of above

Bond formed by mutual sharing of electron is:

1. Ionic bond
2. Coordinate covalent bond
3. Covalent bond
4. Metallic bond

Which of the following diagram shows atoms are bonded with same electronegativity?

1. A —–:—– B
2. A ———-: B
3. A :———- B
4. A –:——– B

Which of the following gas diffuses fastest?

1. Hydrogen
2. Chlorine
3. Fluorine
4. Helium

The vapour pressure of a liquid increases with the:

1. Increase of pressure
2. Increase of temperature
3. Increase of intermolecular forces
4. Increase the polarity of molecules

The freezing point depends upon:

1. Nature of liquid
2. Pressure
3. Temperature
4. Volume

One atmospheric pressure is equal to:

1. 10325 Pascal
2. 106075 Pascal
3. 10523 Pascal
4. 101325 Pascal

Which of the following can be separated by physical means?

1. Mixture
2. Element
3. Compound
4. Substance

Which of the following does not affect the boiling point?

1. Intermolecular forces
2. External pressure
3. Initial temperature of liquid
4. Nature of liquid

The mobility of liquids is lesser than:

1. Solids
2. Gases
3. Plasma
4. Bose Einstein Condensate

Which of the following have sharp melting point in solids?

1. Plastic
2. Rubber
3. Glass
4. Diamond

Which of the following are lightest form of matter?

1. Solid
2. Liquid
3. Gases
4. Plasma

The liquid molecules leave the surface of liquid in evaporation process because:

1. Energy is low
2. Energy is moderate
3. Energy is high
4. None of these

The density of gases increases when its:

1. Pressure increased
2. Temperature increased
3. Volume increased
4. None of these

An alloy is the homogeneous mixture of:

1. Two solid
2. Two liquid
3. Two gases
4. Solid and liquid

A saturated solution of KCl on heating becomes:

1. Unsaturated
2. Supersaturated
3. Diluted
4. All of these

If we dissolve sand into the water, then the mixture is said to be:

1. Solution
2. Suspension
3. Colloids
4. Concentrated solution

Solubility is usually expressed in grams of the solute dissolved in ____gram of a solvent.

1. 10 grams
2. 100 grams
3. 500 grams
4. 1000 grams

The atomic mass of an element expressed in gram is:

1. Gram molecular mass
2. Gram atomic mass
3. Gram formula mass
4. Mole

Example of heterogeneous mixture is:

1. Sugar and water
2. Sand and water
3. Salt and water
4. Ink and water

2 moles of sodium chloride (NaCl) is equal to?

1. 123 grams
2. 135 grams
3. 158 grams
4. 117 grams

Molarity of a solution which is prepared by dissolving 40g sodium chloride in 500cm^3 of solution is?

1. 1.4M
2. 1.33M
3. 1.33M
4. 1.5M

10% (w/w) sugar solution mean that 10 grams of solute dissolved in?

1. 90g of water
2. 95g of water
3. 100g of water
4. 105g of water

An example of true solution is:

1. Solution of starch
2. Solution of soap
3. Ink in water
4. Tooth paste

Which solution contain more water?

1. 1.0M
2. 0.75M
3. 0.5M
4. 0.25M

When a saturated solution is diluted, it change into:

1. Saturated solution
2. Unsaturated solution
3. Concentrated solution
4. Supersaturated solution

Butter is example of solution?

1. Gas-liquid
2. Solid-liquid
3. Liquid-solid
4. Gas-solid

A solution that contain solid solute into liquid solvent is called?

1. Solids in gas
2. Liquids in solids
3. Solids in solids
4. Solids in liquid

What is the particle size in suspension?

1. 10 nm^3
2. 10 nm^2
3. Less than 10 nm^3
4. Greater than 10 nm^3

The branch of Chemistry which deals with hydrocarbons:

1. Industrial chemistry
2. Inorganic chemistry
3. Organic chemistry
4. Physical chemistry

Alloy of Cu – Sn is called:

1. Brass
2. Bronze
3. Monel
4. Bell metal

Which one of the following is Alloy?

1. Graphite
2. Mercury
3. Steel
4. Water

Value of 1 Farady is equal to:

1. 9.65 C
2. 9650 C
3. 96500 C
4. 965 C

Which one of the following is non-electrolyte?

1. Aqueous HCl
2. Aqueous NaCl
3. Molten KCl
4. Urea

Which one of the following is oxidizing agent?

1. Al
2. H2S
3. Cl2
4. NaH

Which one of the following is reducing agent?

1. H2S04
2. HNO3
3. Al
4. I2

Which one of the following forms weak electrolyte solution with water?

1. HCl
2. KOH
3. NaCl
4. CH3COOH

In Daniel cell ____ is used as cathode.

1. Zn
2. Cu
3. Sn
4. Pb

1 g equivalent weight of Aluminum is equal to:

1. 9 g
2. 27 g
3. 54 g
4. 1 g

Which one of the following is correct statement?

1. Oxidation occurs at cathode
2. Reduction occurs at anode
3. Reduction occurs at cathode
4. Ions lose electrons at cathode

Serve deficiency of Vitamin D results in?

1. Beriberi
2. Night Blindness
3. Scurvy
4. Rickets

Which one metal belongs to Alkaline earth metal?

1. B
2. Bi
3. Br
4. Ba

Which one of the following is Barium?

1. Bi
2. Be
3. Ba
4. Br

Chlorine can be displaced by:

1. F
2. Br
3. I
4. At

Which one of the following is strong acid?

1. HF
2. HCl
3. HBr
4. HI

Which Halogen exists in liquid state?

1. F2
2. CI2
3. Br2
4. I2

Non-metals of ____ group are gases.

1. VI-A
2. VII-A
3. VIII-A
4. VIII-B

Which one of the following is Metalloid?

1. Br
2. Se
3. S
4. Sr

Which one of the following act as oxidizing agent?

1. Be
2. Mg
3. Na
4. Cl

Which gas can turn lime water milky?

1. O2
2. NO2
3. CO2
4. N2

Which compound is known as lunar caustic?

1. KNO3
2. AgNO3
3. NaOH
4. NaNO3

IMPORTANT: Read all 9th Class Subjects MCQs for more practice and preparation.