NCERT Class 11/MCQ Questions for Class 11 Chemistry sets 1 Sample Test,Sample questions

Question:
A body of mass 10 mg is moving with a velocity of 100 ms-1. The wavelength of de-Broglie wave associated with it would be (Note: h = 6.63 × 10-34 Js)

1.6.63 × 10-37 m

2.6.63 × 10-31 m

3. 6.63 × 10-34 m

4.6.63 × 10-35 m


Question:
A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at:

1.518 nm

2.1035 nm

3.325 nm

4.743 nm


Question:
A sub-shell with n = 6 , l = 2 can accommodate a maximum of

1.12 electrons

2. 36 electrons

3. 10 electrons

4.72 electrons


Question:
A symbol not only represents the name of the element but also represents

1.Atomic Mass

2.Atomic Number

3.Atomicity

4.Atomic Volume


Question:
Among the following mixtures, dipole-dipole as the major interaction, is present in

1. benzene and ethanol

2.KCl and water

3.acetonitrile and acetone

4. benzene and carbon tetrachloride


Question:
Among the following the maximum covalent character is shown by the compound

1.MgCl2

2.FeCl2

3.SnCl2

4.AlCl3


Question:
An atom of an element A has three electrons in its outermost orbit and that of B has six electrons in its outermost orbit. The formula of the compound between these two will be

1. A3B6

2.A2B3

3.A3B2

4.A2B


Question:
An organic compound contains carbon , hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. The empirical formula of the compound would be

1.CHO

2.CH4O

3.CH3O

4.CHOC


Question:
Approximate atomic weight of an element is 26.89. If its equivalent weight is 8.9, the exact atomic weight of element would be

1.26.89

2.8.9

3.17.8

4.26.7


Question:
Arrange S, O and Se in ascending order of electron affinity

1. Se < S < O

2.Se < O < S

3.S < O < Se

4.S < Se < O


Question:
Based on lattice enthalpy and other considerations which one the following alkali metals chlorides is expected to have the higher melting point?

1. RbCl

2.KCl

3. NaCl

4.LiCl


Question:
Consider the ground state of Cr atom (Z = 24). The numbers of electrons with the azimuthal quantum numbers, l = 1 and 2 are, respectively:

1.12 and 4

2.12 and 5

3.16 and 4

4.16 and 5


Question:
Dipole-induced dipole interactions are present in which of the following pairs?

1. H2O and alcohol

2.Cl2 and CCl4

3.HCl and He atoms

4.SiF4 and He atoms


Question:
In Hydrogen atom, energy of first excited state is – 3.4 eV. Then find out KE of same orbit of Hydrogen atom

1.3.4 eV

2.6.8 eV

3. -13.6 eV

4. +13.6 eV


Question:
In the Bohrs model of the hydrogen atom, the ratio of the kinetic energy to the total energy of the electron in a quantum state n is:

1.1

2.2

3. -1

4. -2


Question:
In the ground state, an element has 13 electrons in its M-shell. The element is_____.

1. Copper

2.Chromium

3.Nickel

4.Iron


Question:
In the long form of the periodic table, the valence shell electronic configuration of 5s²5p4 corresponds to the element present in:

1.Group 16 and period 6

2.Group 17 and period 6

3.Group 16 and period 5

4. Group 17 and period 5


Question:
In the modern periodic table , the period indicates the value of:

1. Atomic Number

2.Atomic Mass

3.Principal Quantum Number

4.Azimuthal Quantum Number


Question:
In the modern periodic table, the period indicates the value of:

1.Atomic Number

2.Atomic Mass

3.Principal Quantum Number

4.Azimuthal Quantum Number


Question:
Increasing order of electro negativity is

1. Bi < P < S < Cl

2.P < Bi < S < Cl

3. S < Bi < P < Cl

4.Cl < S < Bi < P


Question:
Name the liquid with higher vapour pressure in the following pairs:(a) Alcohol, glycerine (b) Petrol, kerosene (c) mercury, water.

1.Alcohol, Water, Petrol

2.Petrol, Water, Alcohol

3.Alcohol, Petrol, Water

4.None of these


Question:
On the Paulings electro negativity scale the element next to F is

1.N

2.Cl

3.O

4.Ne


Question:
On the Paulings electronegativity scale the element next to F is

1.N

2.Cl

3.O

4. Ne


Question:
or a given principal level n = 4, the energy of its subshells is in the order

1.s < p < d < f

2. s > p > d > f

3.s < p < f < d

4.f < p < d < s


Question:
Representative elements are those which belong to

1.p and d – Block

2.s and d – Block

3. s and p – Block

4. s and f – Block


Question:
The -ve charged particles is called:

1.Anion

2.Cation

3.Radical

4.Atom


Question:
The bond length between hybridised carbon atom and other carbon atom is minimum in

1. Propane

2.Butane

3.Propene

4.Propyne


Question:
The bond length between hybridised carbon atom and other carbon atom is minimum in

1. Propane

2.Butane

3.Propene

4.Propyne


Question:
The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing order of the polarizing power of the cationic species, K+,Ca++, Mg2+, Be2+?

1. Ca2+ < Mg2+ < Be+ < K+

2.Mg2+ < Be2+ < K+ < Ca2+

3.Be2+ < K+ < Ca2+ < Mg2+

4. K+ < Ca2+ < Mg2+ < Be2+


Question:
The chemistry of lithium is very similar to that of magnesium even though they are placed in different groups. Its reason is:

1.Both are found together in nature

2.Both have nearly the same size

3.Both have similar electronic configuration

4.The ratio of their charge and size (i.e. charge density) is nearly the same


Question:
The correct order of first ionization potential among following elements, Be, B, C, N and O is

1.B < Be < C < O < N

2.B < Be < C < N < O

3.Be < B < C < N < O

4.Be < B < C < O < N


Question:
The electronic configuration of an element is 1s², 2s² 2p6, 3s² 3p³. What is the atomic number of the element which is just below the above element in the periodic table

1. 31

2. 34

3.33

4.49


Question:
The electronic configuration of halogen is

1. ns² np6

2.ns² np3

3.ns² np5

4.ns²


Question:
The electronic configuration of silver atom in ground state is

1.[Kr]3d104s1

2.[Xe]4f145d106s1

3. [Kr]4d105s1

4. [Kr]4d95s2


Question:
The electrons of the same orbitals can be distinguished by

1. Principal quantum number

2.Azimuthal quantum number

3.Spin quantum number

4.Magnetic quantum number


Question:
The element californium belongs to a family of :

1.Alkali metal family

2.Actinide series

3.Alkali earthl family

4.Lanthanide series


Question:
The element with atomic number 35 belongs to

1.d – Block

2. f – Block

3. p – Block

4. s – Block


Question:
The group number, number of valence electrons, and valency of an element with the atomic number 15, respectively, are

1.16, 5 and 2

2.15, 5 and 3

3.16, 6 and 3

4.15, 6 and 2


Question:
The hybrid state of sulphur in SO2 molecule is 

1. sp²

2.sp³

3. sp

4.sp³d


Question:
The increasing order (lowest first) for the values of e/m (charge/mass) for

1. e, p, n, α

2.n, p, e, α

3. n, p, α, e

4.n, α, p, e


Question:
The ionization enthalpy of hydrogen atom is 1.312 × 106 J mol-1. The energy required to excite the electron in the atom from n = 1 to n = 2 is

1.8.51 × 105 J mol-1

2.6.56 × 105 J mol-1

3.7.56 × 105 J mol-1

4.9.84 × 105 J mol-1


Question:
The ionization enthalpy of hydrogen atom is 1.312 × 106 J mol-1. The energy required to excite the electron in the atom from n = 1 to n = 2 is

1.8.51 × 105 J mol-1

2.6.56 × 105 J mol-1

3.7.56 × 105 J mol-1

4.9.84 × 105 J mol-1


Question:
The magnetic quantum number specifies

1.Size of orbitals

2.Shape of orbitals

3.Orientation of orbitals

4.Nuclear Stability


Question:
The maximum number of hydrogen bonds that a molecule of water can have is

1.1

2.2

3.3

4.4


Question:
The number of elements in the 5th period of the periodic table is

1.3

2.9

3.8

4.18


Question:
The number of moles present in 6 gms of carbon is:

1. 2

2.0.5

3. 5

4.1


Question:
The number of moles present in 6 gms of carbon is:

1. 2

2.0.5

3.5


Question:
The number of moles present in 6 gms of carbon is:

1.2

2.0.5

3.5


Question:
The number of moles present in 6 gms of carbon is:

1.2

2.0.5

3.5

4.1


Question:
The number of nodal planes present in s × s antibonding orbitals is

1. 1

2.2

3.0

4.3


Question:
The number of types of bonds between two carbon atoms in calcium carbide is

1. Two sigma, two pi

2.One sigma, two pi

3.One sigma, one pi

4.Two sigma, one pi


Question:
The outer orbitals of C in ethene molecule can be considered to be hybridized to give three equivalent sp² orbitals. The total number of sigma (s) and pi (p) bonds in ethene molecule is

1.1 sigma (s) and 2 pi (p) bonds

2.3 sigma (s) and 2 pi (p) bonds

3.4 sigma (s) and 1 pi (p) bonds

4.5 sigma (s) and 1 pi (p) bonds


Question:
The rate of diffusion methane is twice that of X. The molecular mass of X is

1.64.0

2.32.0

3.40

4.80


Question:
The reduction in atomic size with increase in atomic number is a characteristic of elements of-

1. d−block

2. f−block

3. Radioactive series

4. High atomic masses


Question:
The S.I unit of temperature is :

1.Kelvin

2.Celsius

3.Fahrenheit

4.Centigrade


Question:
The significant figures in 3400 are

1.2

2.5

3.6

4.4


Question:
The species having pyramidal shape is

1.SO3

2.BrF3

3.SiO32-

4.OSF2


Question:
The structure of IF7 is

1.Pentagonal bipyramid

2.Square pyramid

3.Trigonal bipyramid

4.Octahedral


Question:
The sulphate of a metal M contains 9.87% of M. This sulphate is isomorphous with ZnSO4.7H2O. The atomic weight of M is

1.40.3

2.36.3

3. 24.3

4.11.3


Question:
The total number of ions present in 111 g of CaCl2 is

1. One Mole

2.Two Mole

3.Three Mole

4.Four Mole


Question:
The value of n in the molecular formula BenAl2Si6O18 is

1.3

2.5

3.7

4.9


Question:
The vapour pressure of water at 300 K in a closed container is 0.4 atm. If the volume of container is doubled, its vapour pressure at 300 K will be

1. 0.8 atm

2.0.2 atm

3.0.4 atm

4.0.6 atm


Question:
Under similar conditions of pressure and temperature, 40 ml of slightly moist hydrogen chloride gas is mixed with 20 ml of ammonia gas, the final volume of gas at the same temperature and pressure will be

1.100 ml

2.20 ml

3.40 ml

4. 60 ml


Question:
What is the concentration of nitrate ions if equal volumes of 0.1 M AgNO3 and 0.1 M NaCl are mixed together

1. 0.1 N

2.0.2 M

3.0.05 M

4.0.25 M


Question:
What is the concentration of nitrate ions if equal volumes of 0.1 MAgNO3 and 0.1 M NaCl are mixed together

1. 0.1 M

2.0.2 M

3. 0.05 M

4. 0.25 M


Question:
What is the normality of a 1 M solution of H3PO4

1.0.5 N

2.1.0 N

3.2.0 N

4.3.0 N


Question:
What is the normality of a 1 M solution of H3PO4

1.0.5 N

2.1.0 N

3.2.0 N

4. 3.0 N


Question:
Which is not a unit of pressure:

1. Bar

2.N/m²

3.Kg/m²

4.Torr


Question:
Which of the following cannot give iodometric titrations

1.Fe3+

2. Cu2+

3.Pb2+

4.Ag+


Question:
Which of the following contains same number of carbon atoms as are in 6.0 g of carbon (C – 12)?

1. 6.0 g Ethane

2.8.0 g Methane

3.21.0 g Propane

4. 28.0 g CO


Question:
Which of the following element has least number of electrons in its M-shell?

1. K

2. Mn

3. Ni

4.Sc


Question:
Which of the following forms the most stable gaseous negative ion?

1.F

2.Cl

3.Br

4. I


Question:
Which of the following is a linear molecule?

1. ClO2

2.CO2

3.NO2

4.SO2


Question:
Which of the following oxides is amphoteric in character?

1.SnO2

2. CO2

3.SiO2

4. CaO


Question:
Which of the following properties generally decreases along a period?

1. Ionization Energy

2.Metallic Character

3.Electron Affinity

4.Valency


Question:
Which of the following sets of quantum numbers represents the highest energy of an atom?

1. n = 3, l = 0, m = 0, s = + 12

2.n = 3, l = 1, m = 1, s = + 12

3.n = 3, l = 2, m = 1, s = + 12

4.n = 4, l = 0, m = 0, s = + 12


Question:
Which of the following statements does not form a part of Bohrs model of hydrogen atom?

1.Energy of the electrons in the orbit is quantised

2.The electron in the orbit nearest the nucleus has the lowest energy

3. Electrons revolve in different orbits around the nucleus

4.The position and velocity of the electrons in the orbit cannot be determined simultaneously


Question:
Which of the following statements in relation to the hydrogen atom is correct?

1. 3s orbital is lower in energy than 3p orbital

2. 3p orbital is lower in energy than 3d orbital

3.3s and 3p orbitals are of lower energy than 3d orbital

4.3s, 3p and 3d orbitals all have the same energy


Question:
Which of the following statements in relation to the hydrogen atom is correct?

1.3s orbital is lower in energy than 3p orbital

2.3s, 3p and 3d orbitals all have the same energy

3.s and 3p orbitals are of lower energy than 3d orbital3

4.3s, 3p and 3d orbitals all have the same energy


Question:
Which of the following types of hybridisation leads to three dimensional geometry of bonds around the carbon atom?

1. sp

2.sp²

3.sp³

4.None of these


Question:
Which of the following weighs the most?

1.One g – atom of nitrogen

2.One mole of water

3.One mole of sodium

4.One molecule of H2SO4


Question:
Which of the following will have the lowest boiling point?

1.2-MethylButane

2.2-MethylPropane

3.2,2-Dimethylpropane

4. n-Pentane


Question:
Which one of the following does not have sp² hybridised carbon?

1.sp²

2. sp³

3.sp

4.sp³d


Question:
Which one of the following does not have sp² hybridised carbon?

1.Acetone

2.Acetic acid

3.Acetonitrile

4.Acetamide


Question:
Which one of the following sets of ions represents a collection of isoelectronic species? (Atomic nos.: F = 9, Cl = 17, Na = 11, Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21)

1.K+, Ca2+, Sc3+, Cl–

2. Na+, Ca2+ , Sc3+, F–

3.K+, Cl–, Mg2+, Sc3+

4. Na+, Mg2+, Al3+, Cl–


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