19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The concentration of water molecules in pure water at 298 K is
For a pure water,
A monoprotic acid in 1.00 M solution is 0.01% ionized. The dissociation constant of this acid is (a) 1 10 x (b) 1 10 x (c) 1 10 x (d) 1 10 x
At infinite dilution, the percentage ionisation for both strong and weak electrolytes is
Concentration CN – in 0.1 M HCN is [Ka = 4 × 10 –10]
For a weak acid HA, Ostwald’s dilution law is represented by the equation (a) a c K 2 (b) a c K (c) a K c c (d) a c K
The a K of an acid is 3.2 10 x . The degree of dissociation of the acid at concentration of 0.2M is (a) 6.0 10 x (b) –2 1.26 10 x (c) –4 x (d) 0.04 10 x
The hydrogen ion concentration of 0.2 N CH3COOH which is 40% dissociated is
Aqueous solution of acetic acid contains
The values of dissociation constants of some acids (at 25°C) are as follows. Indicate which is the strongest acid in water
0.2 molar solution of formic acid is ionized 3.2%. Its ionization constant is
Degree of dissociation of 0.1 N CH3COOH is (Dissociation constant = 1 × 10 –5)
The degree of dissociation of 0.1 M HCN solution is 0.01%. Its ionisation constant would be
The following equilibrium exists in aqueous solution, CH3COOH CH3COO – + H + if dil. HCl is added, without change in temperature, the
A monoprotic acid in 1.00 M solution is 0.01% ionised. The dissociation constant of this acid is
Which of the following is the weakest acid?
Which equilibrium can be described as an acid-base reaction using the Lewis’s acid-base definition, but not using Bronsted-Lowry definition ?
Pure water is kept in a vessel and it remains exposed to atmospheric CO2 which is absorbed, then its pH will be
Arrange NH ,H O,H O ,HF and OH in increasing order of acidic nature. (a) H O NH HF OH H O (b) NH HF H O H O OH (c) HO H O NH HF H O (d) H O HF H O NH OH
Which of the following is least likely to behave as Lewis’s base?
Which one of the following molecular hydrides acts as a Lewis’s acid?
Which of the following molecules acts as Lewis acid?
The strongest conjugate base is (a) NO
Which of the following is not Lewis’s acid ?
BF3 is acid according to