19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which of the following pairs constitutes a buffer?
Solution of 0.1 N NH4OH and 0.1 N NH4Cl has pH 9.25. The pKb of NH4OH is
The principal buffer present in human blood is
For preparing a buffer solution of pH 6 by mixing sodium acetate and acetic acid, the ratio of the concentration of salt and acid should be (Ka = 10 –5)
The pKb of CNis 4.7. The pH of solution prepared by mixing 2.5 mol of KCN of 2.5 mol of HCN in water and making the total volume up to 500 mL is
10–6 M NaOH is diluted by 100 times. The pH of diluted base is
K C K /C x xx a H
w 2H O H O OH ,K 1 10 x at 25ºC hence Ka is : (a) 1 10 x (b) 5.55 10 x (c) 18 10 x (d) 1.00 10 x
The concentration of [H+] and concentration of [OH–] of a 0.1 aqueous solution of 2% ionised weak monoprotic acid is [ionic product of water = 1×10–14]
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
BF3 is acid according to
In the reaction I I I -> the Lewis’s base is
The conjugate base of HPO is (a) PO (b) H PO
According to Lewis concept, acid is
According to Lowry and Bronsted system, the chloride ion (Cl–) in aqueous solution is a
The conjugate base of a weak acid is
Of the given anions, the strongest Bronsted base is
The solubility of AgCl with solubility product 1.6x10-10 in 0.1 M NaCl solution would be (NEET- II 2016)