JEE Main entrance exam Question Bank Solutions

The OH^- concentration in a mixture of 5.0 mL of 0.0504 M NH₄Cl and 2 mL of 0.0210 is M NH₃ solution is x × 10^-6 M. The value of x is ______. (Nearest integer)

[Given K_w = 1 × 10^-14 and K_b = 1.8 × 10^-5]

At 90°C pure water has [H₃O⁺] = 10⁻⁶. What is the value of K_ω at this temperature?

In which of the following species S atom assumes sp³ hybrid state?

(I) (SO₃)

(II) SO₂

(III) H₂S

(IV) S₈

If a compound on analysis was found to contain C = 18.5%, H = 1.55%, Cl = 55.04% and O = 24.81%, then its empirical formula is ______.

Of the two solvent H₂O and D₂O, NaCl dissolves ______.

In the electrolysis method of boron extraction the cathode is made of ______.

The hybridisation of carbanion is:

A monoprotic acid in a 0.1 M solution ionizes to 0.001%. Its ionisation constant is ______.

Calculate pH of mixture of 400 ml of `1/200` M Ba(OH)₂ 400 ml of `1/50` M HCl and 200 ml of 50 water.

400 ml of `1/200` M H₂SO₄, 400 ml of `1/100` M HCl and 200 ml water are mixed together, pH of the resulting solution is ______.

Which of the following salts undergoes anionic hydrolysis?

For the equilibrium

\[\ce{SrCl2 * 6 H2O (s) <=> SrCl2 * 2 H2O (s) + 4H2O (g)}\]

the equilibrium constant K_p = 16 × 10^-12 atm⁴ at 1° C. If one litre of air saturated with water vapour at 1°C is exposed to a large quantity of \[\ce{SrCl2 · 2H2O(s)}\], what weight of water vapour will be absorbed? Saturated vapour pressure of water at 1°C = 7.6 torr.

pH of 10^-15 M HCl solution is ______.

108 g of silver (molar mass 108 g mol^-1) is deposited at cathode from AgNO₃ (aq) solution by a certain quantity of electricity. The volume (in L) of oxygen gas produced at 273 K and 1 bar pressure from water by the same quantity of electricity is ______.

When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are:

The percentage composition of carbon by a mole in methane is ______.

116 g of a substance upon dissociation reaction, yields 7.5 g of hydrogen, 60 g of oxygen and 48.5 g of carbon. Given that the atomic masses of H, O and C are 1, 16 and 12 respectively. The data agrees with how many formulae of the following?

In compound C, H and N atoms are present in 9 : 1 : 3.5 by weight. Molecular weight of the compound is 108. Molecular formula of the compound is ______.

Hydrolysis of which compound will give carbolic acid?

Which of the following statements is not true about RNA?