19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
How many milliliters of 0.250 M NH4Cl would have to be added to 450 mL of 0.350 M KOH in order to produce a buffer solution with a pH of 9.10? (Kb(NH3) = 1.8 × 10–5)
Which pair of reagents, mixed in the appropriate proportion, could make a buffer in pH 3-4 range ?
A buffer is prepared by adding 0.30 mol CH3COONa to 2.0 L of a 0.10 M CH3COOH solution. Calculate the eq K /c (x y) eq K c/(xy) 1/(x y) x y 1 x y eq K /c x y eq K /xyc pH after 0.030 mol HCl are …
The pH of 10–5 M HCl solution if 1 ml of it is diluted to 1000 ml is :
When one drop of a concentrated HCl is added to 1 L of pure water at 25ºC, the pH drops suddenly from 7 to 4. When the second drop of the same acid is added, the pH of the solution further drops to about
A student dissolved 0.100 mol of an unknown monoprotic acid, HA, in sufficient water to make 1.00 L of solution. She measured the pH of the solution as pH = 2.60. Of the following, the acid HA is
For a “c molar” concentrated solution of a weak electrolyte AxBy, the degree of dissociation is given as (a) (b) (c) (d)
What is the equilibrium [OH–] in 0.1413 M H2CO3 ? H CO H O H O HCO (Ka = 4.30 ×10–7)
A mixture of weak acid is 0.1 M in HCOOH a K 1.8 10 x and 0.1 M in HOCN a K 3.1 10 x Hence, [H O ] is
The equilibrium constant for this reaction is approximately 10–3. HPO (aq.) HCO (aq.) H PO (aq.) CO (aq.) Which is the strongest conjugate base in this reaction? (a) HPO (aq.) (b) HCO (aq.) (c) H PO (aq.) (d…
Consider the following reaction which proceeds predominantly forward HSO NH NH SO From the information given it is clear that (a) HSOis a stronger acid than NH.
The pH of the solution containing 50 mL each of 0.10 M sodium acetate and 0.01 M acetic acid is [Given pKa of CH3COOH = 4.57] (NEET 2022)
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)
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)
Degree of dissociation of 0.1 N is acid (K 1 10 ) x (CPMT 2006) (a) (b) (c) (d)