Class 9 Chemistry MCQs Tests

The nitrogen has 7 protons in its nucleus, its atomic number is:

The atomic mass of Sodium is 23, its atomic number is:

The symbol of Sodium is:

The atomic number of Helium (He) is:

The atomic number and atomic mass of Magnesium are ______ and _______.

Atomic number of Oxygen is 8, its atomic mass is:

Atomic number of Aluminum is 13, its atomic mass is:

The symbol of Hydrogen is H, its atomic number is 1, and its atomic mass is:

Atomic number, atomic mass and Symbol of Potassium are:

The atomic mass of Carbon is:

A chemist performed an experiment to check the percentage purity of a sample of glucose (C₆ H₁₂ O₆).

Haber’s process converts large quantities of hydrogen and nitrogen into ammonia (NH₃ ).

Gases can be compressed by applying pressure.

Chlorofluorocarbon compounds are responsible for the depletion of ozone layer.

Element radium decays by emitting α-particles and is converted into another element radon.

Ammonia is a colourless gas with a pungent irritating odour. It is highly soluble in water.

Acetylene is the simplest hydrocarbon that contains a carbon-carbon triple bond. Hydrocarbons are the compounds of carbon and hydrogen.

Calorimeter is a device that measures the amount of heat, a substance absorbs on heating or emits on cooling.

Hair contain a special class of proteins called keratins, which are present in nails and wool. Proteins contain chains of C-atoms.

White lead is a pigment used by artists for centuries, the metal Pb in the compound is extracted from its ore, galena (PbS).

An analyst determines that NO₂ is responsible for acid rain.

Plantation helps in overcoming the greenhouse effect.

Some examples of complete protein food are meat, milk, and eggs.

Photosynthesis produces glucose and oxygen from carbon dioxide and water in presence of chlorophyll and sunlight.

Sulphuric acid (H₂ SO₄) is extremely corrosive to skin.

α-particles (He⁺⁺) when bombard on nitrogen atom, a proton is emitted.

Ice floats on water.

In Pakistan, most of the factories use wet process for the production of cement.

A cornstalk grows from a seed.

Sulphur dioxide is the major source of acid rain.

Gasoline (a mixture of hydrocarbons) fumes are ignited in an automobile engine.

Many other light chlorinated hydrocarbons in drinking water are carcinogens.

Purple iodine vapour appears when solid iodine is warmed.

Carbon-14 is continuously produced in the atmosphere when high energy neutrons from space collide with nitrogen-14.

Dynamite (C₃ H₅ N₃ O₉) explodes to form a mixture of gases.

A silver article tarnishes in air.

A compound with chemical formula Na₂CX₃ has formula mass 106 amu. What is the atomic mass of the element X?  [Atomic Masses: C=12, Na=23]

The empirical formula for caffeine (C₈H₁₀N₄O₂) is:

How many moles of Na atoms are present in 2.3 g of Na?

0.25 moles of SO₂ will contain:

Atomic masses of H and O are 1 amu and 16 amu respectively. The molecular mass of hydrogen peroxide (H₂O₂) is:

If molar mass of a compound is 90 g/mole, the number of its moles containing 3.011×10²³ molecules will be:

How many atoms are there in 0.1 moles of Carbon?

A compound with chemical formula BaSX₄ has a formula mass 233 amu. Atomic mass of the element X is:

Which of the following is the correct empirical formula of C₆H₄O(NO₂)₃?

How many atoms are there in 1.25 moles of Zinc?

A sub-shell that can accommodate 6 electrons is:

Identify the number of electrons that f-sub shell can accommodate.

Value of Plank’s constant is:

Which of the following is a defect of Rutherford atomic model?

According to Bohr atomic model:

Rutherford used _____ particles in his experiments.

Which one of the following sub shell is filled after filling of 3p sub shell?

Carbon has __________ isotopes.

Number of neutrons in ²⁷M₁₃ are:

₁₁Na has electronic configuration:

Chlorine has two isotopes, both of which have:

Keeping in view Auf Bau Principle, identify the energy level which the elements fill first.

M shell has sub-shells:

Isotopes of an element have similar:

Identify the isotope used as a Tracer in diagnosing Thyroid problem:

As the value of n increases: 

Chemical properties of an element depend upon the number of:

Which isotope is used to trace the path of carbon in photosynthesis?

When Uranium-238 decays into Thorium-234, it emits:

Which isotope of Uranium is rare?

The fission of uranium–235 yields:

Which of the following statement is not correct about isotopes?

Which of the following isotopes is used to trace the flow of blood and detect possible constrictions or obstructions in the circulatory system?

Which isotope is commonly used to irradiate cancer cells?

The nuclear energy released by the fission of one kilogram of uranium–235 is equivalent to chemical energy produced by burning more than:

_______ do not take part in ordinary chemical reactions.

Which isotope is used in nuclear reactors?

The word isotopes was first used by scientist

The energy of an electron in an orbit is proportional to

Electrons revolve only in those orbits with angular momentum as an

Which carbon is not black in colour?

Formula for heavy water is:

Rutherford use ________ as a source of alpha particles.

TRITIUM has number of neutrons

Almost entire mass of an atom is concentrated in the

When an electron changes its orbit from higher to lower, energy is

Maximum number of electrons in a shell can be calculated by

Which of the following is a defect of Rutherford atomic model?

_________ is highly inflammable gas.

All the isotopes of carbon are _______ in water.

Alpha particles which were deflected backward in Rutherford's experiment were hit upon by

The value of Planks constant is

An element is placed in second period of periodic table and have six protons and six neutrons in its nucleus. The element is _____.

Which isotope can be used for radiotherapy for cancer patients?

Energy released by the isotopes uranium - 235 is due to the process:

Which of the following is true about the isotopes?

Which of the following isotopes of uranium is most abundant?

According to 2n² rule, L-Shell contains maximum___ electrons.

Maximum number of electrons in d sub shell are:

Atomic number of Na is 11. electronic configuration of the Na is _____.

Correct increasing order of energy of sub shell is:

Electronic configuration of an element is as shown: 1s², 2s², 2p⁶, 3s², 3p⁵ Identify the element which contains this electronic configuration.

We can compare the activity of isotopes of carbon from skull and jaw bones of dead organism.

_{ 17 }^{ 37 }{ Cl } has how many protons?

Electronic configuration for an element is as shown. 1s², 2s², 2p⁶, 3s², 3p⁵ . Which of the following is correct regarding this electronic arrangement?

An element has two protons in its nucleus. The symbol of the element is _____.

Sub shells are also called as:

Elements are arranged in the order of increasing:

By 1925, ____ elements were known.

Elements with similar valance shell electronic configuration are placed in the same:

The horizontal rows of the periodic table are called:

First _____ periods are called short periods.

Metallic elements in Group 1A are called:

Number of periods in the Periodic table are:

By the end of 18th century, _______ elements were known.

On the basis of outermost valence sub-shell, elements in the periodic table can also be classified into:

Last _____ periods are long periods.

Each vertical column of elements in the periodic table is called a:

Group B elements are called:

Elements of Group IA and Group IIA contain their valence electrons in:

A table showing systematic arrangement of elements is called:

The Group VIIIA elements are called:

Group IIA elements are called:

Group A elements are called:

The elements of Group VIIA are called:

The atomic number was discovered in:

Atomic number was discovered by:

The number of electrons in the valence shell of halogens are _____.

Across a period (left to right), shielding effect _____.

The number of electrons in the valence shell of alkali metals is _____

The number of elements in the first period is _____.

John Newland found the similarity in properties of every ________ element.

Element having configuration 1s² belongs to group:

__________ of element indicates the number of electrons in the valence shell.

The elements of Group IIIA to VIIIA (except He) are known as:

Physical properties depend on the:

Which of the elements are not p-block representative elements?

____________ of element indicates n value of the valence shell.

What is the period number of Nitrogen -7 ?

Valence shell configuration of Na is:

Which of the following has the lowest shielding effect?

Chemical properties depend on the:

The elements of B-group are called _____.

The horizontal rows in a periodic table are known as _____.

Which of the following has the highest shielding effect?

Elements in the same vertical group of the periodic table have same _____.

Because all the elements of a particular group have similar valence shell electronic configuration, they possess similar:

The number of electrons in the valence shell of halogens are _____.

The number of electrons in the valence shell of alkali metals is _____.

Which of the following has the highest shielding effect?

The elements of B-group are called _____.

Elements in the same vertical group of the periodic table have same _____.

Which of the following has the lowest shielding effect?

John Newland found the similarity in properties of every ------ element.

Across a period (left to right), shielding effect _____.

The horizontal rows in a periodic table are known as _____.

Which of the elements are not p-block representative elements?

Atomic number is discovered by

Element having configuration 1s² belongs to group

The number of elements in the first period is _____.

Valence shell configuration of Na is

What is the period number of Nitrogen -7 ?

Arrange the elements in decreasing ionization energy.

Ionization energy is a/an _____.

The state required for Chlorine to release energy and form a uninegative ion is _____.

Which of these represents an element with a large electron affinity?

Atomic radii decreases because of

Electronegativity refers to _____.

Which of the following has the highest electron affinity?

Negative sign is given to electron affinity because energy is _____.

Ionization energy is measured in _____.

Electron affinity involves _____.

When atomic radius increases, electron affinity _____.

In general, ionization energy _____ going bottom to top within a group in the periodic table.

Ionization results in the ejection of _____.

Element in group II A with smallest atomic radius is _____.

Which element has the highest electronegativity?

Which of the following metals will have the lowest melting point?

Which alloy is used by dentists?

Choose the correct order for metallic character.

Name the Property of elements to lose electron and become cation .

As we go from Li to Cs, electropositive character _____.

Nature of oxides of aluminium are

Potassium super oxide react with moisture and carbon dioxide and produce

Metallic bonding involves _____.

Name the mixture to which gold and platinum can react.

Which of the following will react with most ease with oxygen present in the air?

Which of the following does not represent a symbol for noble metal?

Which of the following metals is NOT an active metal?

Copper nickle alloy is used to make

Electropositive character is also known as _____.

Among all the alkali metals, cesium has the lowest ionization energy. Which of these will then have the highest electropositive character?

When hydrogen halides dissolve in water , it will form

Which of the following halogens does NOT exist in diatomic form?