Chemistry Question Bank

[CBSE AIPMT 2015] The orbital angular momentum of an electron in a d orbital is equal to

[NEET 2014] Calculate the energy in joule corresponding to light of wavelength 45 nm. (h = 6.63 × 10⁻³⁴ Js, c = 3 × 10⁸ ms⁻¹)

[Kerala CEE 2014] The ratio of de Broglie wavelengths of a deuterium atom to that of an α-particle, when the velocity of deuterium is five times that of the α-particle, is

[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

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

[NEET 2013] What is the maximum number of electrons that can be associated with the quantum numbers n=3, l=1 and m=−1?

[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?

[AIPMT 2012] Maximum number of electrons in a subshell with l = 3 and n = 4 is

[KCET 2012] The nitride ion in lithium nitride (Li₃N) is composed of

[Manipal 2010] Which one of the following statements in relation to the hydrogen atom is correct?

[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] The total number of atomic orbitals in the fourth energy level of an atom is

A mixture of ethane and ethene occupies 40 litre at 1.00 atm and at 400 K. The mixture reacts completely with 130 g of to produce and . Assuming ideal gas behavior, calculate the mole fraction of and in the mixture.

What volume of 0.010 M is required to react completely with 30 g of an aqueous acetic acid solution in which mole fraction of acetic acid is 0.15?

The molecular mass of an organic acid was determined by the study of its barium salt. 4.290 g of salt was quantitatively converted to free acid by the reaction with 21.64 mL of . The barium salt was found to have two …

A 2.00 g portion of a sample containing NaBr and was dissolved and diluted to 250 mL. One fifth aliquot portions were titrated by silver nitrate, an average of 42.5 mL solution being required for the aliquot portion. …

An element (X) reacts with hydrogen leading to formation of a class of compounds that is analogous to hydrocarbons. 5.00 g of X forms 5.625 g of a mixture of two compounds of in the molar ratio of 2:1. Determine the m…

6.0 g of a sample containing and is dissolved in 100 mL water. A 10 mL portion of this solution on treatment with solution results in complete precipitation of and giving 0.9065 gram of precipitate. The precipitate th…

An element X forms an iodide and a chloride . The iodide is quantitatively converted to the chloride when it is heated in a stream of chlorine

Aspirin , is prepared by heating salicylic acid, with acetic anhydride, . The other product is acetic acid, ,

A mixture of and is heated until all the water is driven-off. If 5.0 gm of a mixture gives 3g of anhydrous salts, what is the percentage by mass of in the original mixture?

Potassium salt of benzoic acid can be made by the action of potassium permanganate on toluene as follows:

What volume of a 1.36 M HCl solution should be added to a 200 mL 2.4 M HCl solution and finally diluted to 500 mL so that molarity of final HCl solution becomes 1.24 M.

A 0.65 M solution is prepared by dissolving pure solid in water. Determine the mass of hydrated salt dissolved per milliliter of solution and mass of anhydrous present per milliliter of solution. Molar masses are : Ba…

A 10 g sample of , gave on complete decomposition , 2.24 L of oxygen at NTP. What is the percentage purity of the sample of potassium chlorate?