Chemistry Question Bank

The number of photons of light with wave number ν̄ = 2.5 × 10⁶ m⁻¹ necessary to provide 1 J of energy are

Which is NOT a characteristic of Planck's quantum theory of radiation?

Calculate the frequency of yellow radiation having wavelength 5800 Å.

Rutherford's nuclear model of the atom failed to explain

In the Rutherford scattering experiment, most α-particles passed straight through the gold foil because

[Kerala CEE 2014] The maximum number of electrons that can be held by a subshell with azimuthal quantum number 'l' in an atom is given by

The threshold wavelength for the photoelectric effect on sodium is 5000 Å. Its work function is:

[CBSE AIPMT 2013] Based on equation E = −2.178 × 10⁻¹⁸ J × Z²/n², which of the following is NOT correct?

[NEET 2013] Planck's constant h = 6.63 × 10⁻³⁴ Js. Speed of light c = 3 × 10¹⁷ nm/s. Which value is closest to the wavelength (in nm) of a quantum of light with frequency 6 × 10¹⁵ s⁻¹?

[CBSE AIPMT 2011] The energies E₁ and E₂ of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths λ₁ and λ₂ will be

[CBSE AIPMT 2011] If n = 6, the correct sequence of filling of electrons will be

[KCET 2010] The wave number of a spectral line in the emission spectrum of hydrogen will be equal to (8/9)R_H if the electron jumps from

[AMU 2010] When the electron of a hydrogen atom jumps from n = 4 to n = 1 state, the number of spectral lines emitted is

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

[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)

The ionization energy of H atom is 13.6 eV. The ionization energy of Li²⁺ ion will be

A mixture contains n moles of \(\mathrm{H_2}\) and 2n moles of \(\mathrm{CH_4Th}\) ratio of no. of C:H atoms in the mixture is:

A mixture of KBr and NaBr weighing 0.560 gm was treated with aqueous Ag⁺ and all the bromide ion was recovered as 0.970 gm of pure AgBr. The weight of KBr in the sample is

250 ml of a sodium carbonate solution contains 2.65 grams of \(\mathrm{Na_2CO_3}\) If 10 ml of this solution is diluted to one litre, what is the concentration of the resultant solution? (mol wt. of \(\mathrm{Na_2CO_3…

The number of H⁺ ions present in 100 ml of 0.001M \(\mathrm{H_2SO_4}\) solution will be

50 ml of 0.01 M \(\mathrm{FeSO_4}\) will react with what volume of 0.01 M \(\mathrm{KMnO_4}\) solution in acid medium?

20 ml of 0.2 M \(\mathrm{Al_2SO_4}\) is mixed with 20 ml of 0.6 M \(\mathrm{BaCl_2}\) Concentration of \(\mathrm{Al_3}\) ion in the solution will be

Molarity of 1g \(\mathrm{H_2SO_4}\) solution in 1 lit. water is nearly

An aqueous solution of urea containing 18 g urea in 1500 cc of solution has a density of 1.052 g/cc. If the mol.wt. of urea is 60, then the molality of solution is

A gaseous oxide contains 30.4% of nitrogen, one molecule of which contains one nitrogen atom. The density of the oxide relative to oxygen gas is