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MCQ Questions for Class 11 Chemistry sets 1

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





✅ Correct Answer: 4

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





✅ Correct Answer: 2

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





✅ Correct Answer: 2

The -ve charged particles is called:





✅ Correct Answer: 1

Which is not a unit of pressure:





✅ Correct Answer: 3

What is the normality of a 1 M solution of H3PO4





✅ Correct Answer: 4

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





✅ Correct Answer: 3

Which of the following weighs the most?





✅ Correct Answer: 3

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





✅ Correct Answer: 2

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





✅ Correct Answer: 3

Which of the following cannot give iodometric titrations





✅ Correct Answer: 3

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





✅ Correct Answer: 3

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





✅ Correct Answer: 1

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





✅ Correct Answer: 2

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





✅ Correct Answer: 2

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





✅ Correct Answer: 2

The significant figures in 3400 are





✅ Correct Answer: 2

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





✅ Correct Answer: 3

What is the normality of a 1 M solution of H3PO4





✅ Correct Answer: 4

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





✅ Correct Answer: 3

The S.I unit of temperature is :





✅ Correct Answer: 1

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





✅ Correct Answer: 4

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





✅ Correct Answer: 4

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





✅ Correct Answer: 1

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:





✅ Correct Answer: 4

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





✅ Correct Answer: 4

The magnetic quantum number specifies





✅ Correct Answer: 3

The electronic configuration of silver atom in ground state is





✅ Correct Answer: 3

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





✅ Correct Answer: 1

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)





✅ Correct Answer: 1

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





✅ Correct Answer: 2

The electrons of the same orbitals can be distinguished by





✅ Correct Answer: 3

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





✅ Correct Answer: 2

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)





✅ Correct Answer: 2

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





✅ Correct Answer: 4

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





✅ Correct Answer: 1

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





✅ Correct Answer: 3

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:





✅ Correct Answer: 3

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





✅ Correct Answer: 4

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





✅ Correct Answer: 4

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





✅ Correct Answer: 3

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





✅ Correct Answer: 4

The element with atomic number 35 belongs to





✅ Correct Answer: 3

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





✅ Correct Answer: 1

Representative elements are those which belong to





✅ Correct Answer: 3

Which of the following properties generally decreases along a period?





✅ Correct Answer: 2

On the Paulings electronegativity scale the element next to F is





✅ Correct Answer: 3

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





✅ Correct Answer: 2

Which of the following oxides is amphoteric in character?





✅ Correct Answer: 1

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





✅ Correct Answer: 3

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





✅ Correct Answer: 3

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





✅ Correct Answer: 1

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





✅ Correct Answer: 3

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





✅ Correct Answer: 3

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





✅ Correct Answer: 2

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





✅ Correct Answer: 4

The electronic configuration of halogen is





✅ Correct Answer: 3

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





✅ Correct Answer: 2

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





✅ Correct Answer: 3

The element californium belongs to a family of :





✅ Correct Answer: 2

Increasing order of electro negativity is





✅ Correct Answer: 1

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





✅ Correct Answer: 4

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





✅ Correct Answer: 4

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





✅ Correct Answer: 1

The hybrid state of sulphur in SO2 molecule is





✅ Correct Answer: 1

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





✅ Correct Answer: 1

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





✅ Correct Answer: 3

Which of the following will have the lowest boiling point?





✅ Correct Answer: 4

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





✅ Correct Answer: 4

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





✅ Correct Answer: 2

The value of n in the molecular formula BenAl2Si6O18 is





✅ Correct Answer: 1

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





✅ Correct Answer: 2

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





✅ Correct Answer: 2

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





✅ Correct Answer: 4

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





✅ Correct Answer: 2

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





✅ Correct Answer: 3

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





✅ Correct Answer: 3

The structure of IF7 is





✅ Correct Answer: 1

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+?





✅ Correct Answer: 4

The species having pyramidal shape is





✅ Correct Answer: 4

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





✅ Correct Answer: 4

Which of the following is a linear molecule?





✅ Correct Answer: 2

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





✅ Correct Answer: 3

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





✅ Correct Answer: 3

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





✅ Correct Answer: 1