Chemistry Question Bank

[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

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

The density of chlorine relative to air as mentioned in above problem is

Vapour density of air is (considering air as 80% and )

Consider the reaction 2A 2B, B 2C, 3C 4D. The no. of moles of D formed starting 4 moles of A, are

2.4 kg of carbon is made to react with 1.35 kg of aluminium to form \(\mathrm{Al_4C_3}\) The maximum amount in kg of aluminium carbide formed is

For the reaction A + 2B C + 3D, 5 moles of A and 8 moles of B will produce

0.5 mole of \(\mathrm{H_2SO_4}\) is mixed with 0.2 mole of Ca(OH)₂. The maximum number of mole of \(\mathrm{CaSO_4}\) formed is

If 0.5 mol of \(\mathrm{BaCl_2}\) is mixed with 0.2 mol of \(\mathrm{Na_3PO_4}\) the maximum number of mol of \(\mathrm{Ba_3PO_4}\) that can be formed is

Calculate the weight of iron which will be converted into its oxide by the action of 18g of steam on it. .

The percent loss in weight after heating a pure sample of \(\mathrm{KClO_3}\) (molecular weight = 122.5) will be

If 1 mole of ethanol \(\mathrm{C_2H_5OH}\) completely burns to \(\mathrm{CO_2}\) and \(\mathrm{H_2O}\) the weight of \(\mathrm{CO_2}\) formed is about.

In an experiment, it is found that 2.0769 g of Pure X produces 3.6769 g of pure \(\mathrm{X_2O_5}\) The number of moles of X is

If two mole of methanol \(\mathrm{CH_3OH}\) completely burns to carbon dioxide and water, the weight of water formed is about

How many grams of phosphoric acid \(\mathrm{H_3PO_4}\) would be needed to neutralise 100 g of magnesium hydroxide (Mg(OH)₂).

2 mol of \(\mathrm{H_2S}\) and 11.2 L \(\mathrm{SO_2}\) at N.T.P. reacts to form x mol of sulphur; x is