Chemistry Sample Papers

From the given sets of quantum numbers the one that is inconsistent with the theory is :

Calculate the momentum of a particle which has a de-Broglie’s wavelength of

The total number of electrons present in all the p-orbitals of bromine are :

When an electron revolves in a stationary orbit then:

The total number of valence electrons in 4.2 gm of ion is ( is the Avogadro’s number) :

If , then the value of which is incorrect :

Chlorine atom differs from chloride ion in the number of :

The uncertainty in the position of an electron () moving with a velocity of accurate upto 0.001% will be (use in the uncertainty expression, where erg-s

A 3p orbital has :

Zeeman effect refers to the :

For n = 3 energy level, the number of possible orbitals are :

The orbital angular momentum of an electron in 2s orbital is :

Which statement is not correct for n = 5, m = 3 :

In a Bohr’s model of atom when an electron jumps from n = 1 to n = 3, how much energy will be emitted or absorbed :

Which of the following metal ions will have maximum number of unpaired electrons :

The maximum probability of finding an electron in the orbital is :

CO has same electrons as or the ion that is isoelectronic with CO is :

The total number of orbital in an energy level designated by principal quantum number n, is equal to :

Which electronic level would allow the hydrogen atom to absorb a photon but not to emit a photon :

An electron has principal quantum number 3. The number of its
(i) subshells and (ii) orbitals would be respectively

Aufbau principle is not satisfied by :

The first use of quantum theory to explain the structure of atom was made by :

Five valence electrons of are labelled as If the spin quantum number of B and Z is + 1/ 2, the group of electrons with three of the quantum number same are :

In an element going away from nucleus, the energy of particle :

In neutral atom, which particles are equivalent :

If , then total possible number of subshells would be :

The configuration shows

The electron configuration of gadolinium (atomic no. 64) is :

If electron falls from n = 3 to n = 2, then emitted energy is :

Number of protons, neutrons and electrons in the element is :

In the ground state configuration of how many orbitals are present having paired and unpaired electrons

Discoverer of positron :

Which of the following species not contains neutrons :

The energy of an electron in the first Bohr orbit of H atom is . The possible energy value of the first excited state for electrons in Bohr orbits to hydrogen is (are) :

The energy of an electron in the first orbit of He+ is . The energy of the electron in the first orbit of hydrogen would be

The position of both an electron and a helium atom is known within 1.0 nm and the momentum of the electron is known within . The minimum uncertainty in the measurement of the momentum of the helium atom is :

The Bohr orbit radius for the hydrogen atom (n = 1) is approximately 0.530 A. The radius for the first excited state (n = 2) orbit is :

Which of the following explain the sequence of filling the electrons in different orbitals :

Number of orbitals having paired electrons for gaseous Fe are :

Which triad of quantum number is not applicable for 3d-electron :

Which of the following configuration follows the Hund’s rule :

The ratio of radii of 3rd and 2nd Bohr’s orbit of hydrogen atom is :

The four quantum number for the valence shell electron or last electron of sodium is :

Heaviest particle is :

Which is correct statement about proton :

The energy of an electron in nth orbit of hydrogen atom is :

If wavelength of photon is ,, then momentum of photon is :

Ground state electron configuration of nitrogen atom can be represent by :

Which of the following has more unpaired d-electron :

The uncertainty in momentum of an electron is . The uncertainty in its position will be :

The de-Broglie wavelength of a particle with mass 1g and velocity 100 m/s is :

Which of the following set of quantum numbers belong to highest energy :

Which of the following are isoelectronic species :

Which quantum number will determine the shape of the subshell :

A metal in its di positive state has the electronic configuration 2, 8, 14 and has the atomic weight equal to 56. Number of neutrons in its nucleus would be :

Which set of quantum number for an electron of an atom is not possible :

Outer electronic configuration of the element of atomic number 24 is :

The basis of three unpaired electrons in the configuration of nitrogen is :

Correct order of size is :

Which is not electromagnetic radiation :

Which of the following pair of orbitals posses two nodal planes :

The mass of a neutron is of the order of :

Smallest cation is :

Electron enters the sub-shell for which value is minimum. This is enunciated as :

The minimum real charge on any particle which can exist is :

Which sub-shell is not permissible :

Sub-shell designated by azimuthal quantum number can have maximum number of electrons :

Quantum number shows how many orbitals :

Which is isoelectronic with sulphide ion :

Ground state electronic configuration of nitrogen is :

In the Bohr’s orbit, what is the ratio of total kinetic energy and total energy of electron :

Rutherford α-particle dispersion experiment concludes :

Which of the following element outermost orbit’s last electron has magnetic quantum number m = 0 ?

The value of Planck’s constant is Js. The velocity of light is . Which value is closest to the wavelength in nanometers of a quantum of light with frequency of ?

The orbital angular momentum for an electron revolving in an orbit is given by for an s-electron will be given by :

The number of d-electrons retained in (At. no. of Fe = 26) ion is :

The de Broglie wavelength of a tennis ball of mass 60 g moving with a velocity of 10 metres per second is approximately :

In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inter-orbit jumps of the electron for Bohr orbits in an atom of hydrogen ?

Which of the following sets of quantum number is correct for an electron in 4f orbital ?

The wavelength of the radiation emitted, when in a hydrogen atom electron falls from infinity to stationary state 1, would be () :

Which one of the following sets of ions represents the collection of isoelectronic species ?

Which of the following have same radius as hydrogen n = 1 :

Of the following sets which one does NOT contain isoelectronic species ?

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

Which of the following factors may be regarded as the main cause of lanthanide contraction ?

Which of the following molecules/ions does not contain unpaired electrons ?

Uncertainty in the position of an electron moving with a velocity 300 , accurate upto 0.001%, will be

Which one of the following sets of ions represents a collection of isoelectronic species ?

Lanthanoid contraction is caused due to

Atomic radius is of the order of cm and nuclear radius is of the order of cm. Calculate what fraction of atom is occupied by nucleus ?

The atomic masses of two isotopes of O are 15.9936 and 17.0036. Calculate in No. of neutrons atom

The mass charge ratio for ion is kg . Calculate the mass of A atom.

AIR service on Vividh Bharati is transmitted on 219 m band. What is its transmission frequency in Hertz ?

Calculate the number of proton emitted in 10 hours by a 60 W sodium lamp ( or photon )

Calculate momentum of radiations of wavelength 0.33 nm.

The ionization energy of $.\; The\; energy\; of\; the\; first\; stationary\; state\; of$ will be :

Which of the following set of quantum numbers are permitted

Find out the energy of H atom in first excitation state.The value of permittivity factor

The shortest wave length in H spectrum of Lymen series when is

Electromagnetic radiations of wavelength 242 nm is just sufficient to ionise sodium atom. Calculate the ionisation energy of sodium in

On the basis of Heisenberg’s uncertainty principle, show that the electron cannot exist within the nucleus.

Naturally occurring boron consists of two isotopes whose atomic weights are 10.01 and 11.01. The atomic weight of natural boron is 10.81. Calculate the percentage of each isotope in natural boron

The shape of an orbital is given by the quantum number :

Write down the numerical value of h and its unit

Calculate the longest wavelength which can remove the electron from I Bohr’s orbit. Given

The ionization energy of H-atom is 13.6 eV. The ionization energy of ion will be

According to Bohr’s theory, the angular momentum of an electron in 5th orbit is