Chemistry Question Bank

[NEET 2019] In hydrogen atom, the de Broglie wavelength of an electron in the second Bohr orbit is (Bohr radius a₀ = 52.9 pm)

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?

In which of the following pairs do 1 g of each have an equal number of molecules?

The volume of 3M HCl required to completely react with 1.431g of sodium carbonate

How many grams are contained in 1 g atom of Nitrogen

Ratio of carbon to hydrogen atom is maximum in:

Which of the following has the highest mass:

Weight ratio of Fe:C in \(\mathrm{Fe_2FeCN}\) is:

One atom of an element weighs 3.981023g. Its atomic mass is

In what volume ratio a 0.36 M solution should be mixed with another 0.15 M solution to obtain a 0.24 M solution?

A mixture contains and . If both and provide equal number of sulphate ions then, the ratio of and ions in mixture is

25.4 g of iodine and 14.2g of chlorine are made to react completely to yield a mixture of ICl and \(\mathrm{ICl_3}\) Calcualte the ratio of moles of ICl and \(\mathrm{ICl_3}\)

If 224 ml of a triatomic gas has a mass of 1 g at 273 K and 1 atm pressure, then the mass of one atom is