Chemistry Question Bank

Atoms can be further divided into sub-particles like

Early Indian and Greek philosophers were of the view that 'A' are the fundamental building blocks of matter. Here, 'A' refers to

A stream of electrons is passed between two charged plates at potential difference V (esu). If e and m are charge and mass of electron, the value of h/λ (λ = de Broglie wavelength) is

The frequency of light emitted for the transition n = 4 to n = 2 of He⁺ is equal to the transition in H atom corresponding to which of the following?

The emission spectra of He⁺ ions show 6 different photons. What will be the minimum wavelength during the transition? (R_H = Rydberg constant)

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

If the total energy of an electron in the 1st shell of H atom = 0.0 eV (reference shifted), then its potential energy in the 1st excited state would be

Which of the following electronic transitions in a hydrogen atom will require the largest amount of energy?

The most probable radius (in pm) for finding the electron in He⁺ is

The velocity of an electron in the second shell of hydrogen atom is

[Manipal 2009] The uncertainty in position of an electron (m = 9.1 × 10⁻²⁸ g) moving with velocity 3.0 × 10⁴ cm s⁻¹ accurate to 0.011% will be (h = 6.626 × 10⁻²⁷ erg·s)

[CBSE AIPMT 2009] Which of the following is NOT a permissible arrangement of electrons in an atom?

Bohr's theory is NOT applicable to:

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

When electrons of a hydrogen atom return to the L shell (n=2) from higher energy shells, the series of lines formed is called

Which series in the hydrogen spectrum lies in the ultraviolet region?

In the hydrogen spectrum, the Balmer series lies in which region?

The ratio of the energy difference between the 1st and 2nd Bohr orbits to that between the 2nd and 3rd Bohr orbits is

For a Bohr atom, angular momentum of the electron is (n = 1, 2, 3 …)

Which of the following statements does NOT form a part of Bohr's model of hydrogen atom?

The value of a₀ (Bohr radius) in the expression for the radius of nth orbit of hydrogen atom (rₙ = n²a₀) is

Electronic energy is negative because

According to Bohr model, angular momentum of an electron in the 3rd orbit is

[MP PMT 2010] The relation between wave nature of light (photons) and stream of particles is given by de Broglie's equation:

The correct set of four quantum numbers for the valence electron of rubidium (Z = 37) is