19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Accumulation of lactic acid (HC3H5O3), a monobasic acid in tissues leads to pain and a feeling of fatigue. In a 0.10 M aqueous solution, lactic acid is 3.7% dissociated. The value of dissociation constant…
Identify the correct order of solubility in aqueous medium. (NEET 2013)
The values of Ksp of CaCO3 and CaC2O4 are 4.7 x 10-9 and 1.3 x 10-9 respectively at 25C. If the mixture of these two is washed with water, what is the concentration of Ca2+ ions in water? (NEET 2013)
The dissociation constant of a weak acid is 1 x 104. In order to prepare a buffer solution with a pH = 5, the [Salt]/[Acid] ratio should be (NEET 2013)
Which of these is least likely to act as a Lewis’s acid? (NEET 2013)
Buffer solutions have constant acidity and alkalinity because (AIPMT 2012)
Equimolar solutions of the following substances were prepared separately. Which one of these will record the highest pH value? (AIPMT 2012)
pH of a saturated solution of Ba(OH)2 is 12. The value of solubility product (Ksp) of Ba(OH)2 is (AIPMT 2012, 2010)
A buffer solution is prepared in which the concentration of NH3 is 0.30 M and the concentration of NH is 0.20 M. If the equilibrium constant, Kb for NH3 equal 1.8 x 105, what is the pH of this solution? (log 2.7 = 0.4…
Which of the following is least likely to behave as Lewis’s base? (AIPMT 2011)
In a buffer solution containing equal concentration of B– and HB, the Kb for B– is 1010. The pH of buffer solution is (AIPMT 2010)
What is [H+] in mol/L of a solution that is 0.20 M in CH3COONa and 0.10 M in CH3COOH? (Ka for CH3COOH = 1.8 x 10-5) (AIPMT 2010)
Which one of the following molecular hydrides acts as a Lewis’s acid? (AIPMT 2010)
Which of the following molecules do not act as a Lewis’s base? (AIPMT 2009)
What is the [OH-] in the final solution prepared by mixing 20.0 mL of 0.050 M HCl with 30.0 mL of 0.10 M Ba(OH)2? (AIPMT 2009)
The ionization constant of ammonium hydroxide is 1.77 x 105 at 298 K. Hydrolysis constant of ammonium chloride is (AIPMT 2009)
Which of the following molecules acts as Lewis’s acid? (AIPMT 2009)
Among the following the strongest conjugate base is (DUMET 2009) (a) NO
If the solubility of calcium fluoride in pure water is x mol/L, its solubility product is (AFMC 2009) (a) 2x
Solubility product of a salt AB is 1 × 10–8 M2 in a solution in which the concentration of A+ ions are 10–3M. The salt will precipitate when the concentration of B– ions is kept (AFMC 2008)
Equal volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the H+ ion concentration in the mixture ? (CBSE AIPMT 2008) (a) –4 1.11 10 M x (b) 3.7 10 M x (c) 3.7 10 M x (d) …
Which of the following is correct? (CPMT 2008)
The pH of 10–8 M HCl solution is (AFMC 2008)
Calculate the pOH of a solution at 25C that contains 1 x 1010 M of hydronium ions, i.e., H3O+. (AIPMT 2007)
A weak acid, HA, has a K of 1.00 × 10–5. If 0.100 mole of this acid is dissolved in 1L of water, the percentage of acid dissociated at equilibrium is closest to (CBSE AIPMT 2007)