19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Assertion: When aqueous, solution of CH3COOAg is diluted, then its degree of hydrolysis increases. Reason: Silver acetate is the salt of weak acid and weak base; its degree of hydrolysis does not depend on th…
Assertion: When aqueous, solution of CH3COONH4 is diluted, then its degree of hydrolysis increases. Reason: Ammonium acetate is the salt of weak acid and weak base; its degree of hydrolysis does not de…
Assertion: Aqueous solution of ammonium carbonate is basic. Reason: Acidic or Basic nature of a salt solution of a salt of weak acid and weak base depends on Ka and Kb of the acid and base forming it.
Assertion: If a K of HA is 10–3 and a K of HB is 10 at 25ºC, pH of an aqueous solution of HB will be one unit greater than pH of equimolar solution of HA. Reason: For weak acids, both concentration and ionizat…
Assertion: pH of 10–8 M HCl lies between 6 and 7. Reason: For very dilute solutions of acids, H+ ion contribution from water is also taken into consideration.
Assertion: pH of water increases with an increase in temperature. Reason: Kw of water increases with increase in temperature.
Assertion: Addition of HCl(aq.) to HCOOH(aq.) decreases the ionization of HCOOH. Reason: Common ion effect of H+ ion, reduces the ionization of HCOOH.
Assertion (A): H2SO4 acts as a base in the presence of HClO4. Reason (R): Perchloric acid is stronger acid than H2SO4.
The solubility products of MA, MB, MC and MD are 1.8 × 10–10, 4 × 10–3, 4 × 10–8 and 6 × 10–5 respectively. If a 0.01 M solution of MX is added dropwise to a mixture containing A–, B–, C– and D– ions then t…
Ksp of Mg (OH)2 is 1 × 10–12. 0.01 M Mg (OH)2 will be precipitating at the limiting pH :
Calculate the concentration of H+ ion in mol/L of 0.010M solution of NH4Cl? (Kb = 1.8 × 10–6)
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…
Concentration of the Ag ions in a saturated solution of Ag C O is 2.2 10 mol L . x Solubility product of Ag C O is (NEET 2017) (a) 2.66 10 x (b) 4.5 10 x (c) 5.3 10 x (d) 2.42 10 x
MY and NY3. Two nearly insoluble salts, have the same sp K value of 6.2 x 10-15 at room temperature. Which statement would be true in regard to MY and NY3? (NEET-I 2016)
The solubility of AgCl with solubility product 1.6x10-10 in 0.1 M NaCl solution would be (NEET- II 2016)
Which of the following fluoro-compounds is most likely to behave as a Lewis’s base? (NEET-II 2016)
The percentage of pyridine (C H N) that forms pyridinium ion (C H N H) in a 0.10 M aqueous pyridine solution ( b K for C H N 1.7 10 ) x is (NEET 2016)
What is the pH of the resulting solution when equal volumes of 0.1 M NaOH and 0.01 M HCl are mixed ? (AIPMT 2015)
At 100C the Kw of water is 55 times its value at 25C. What will be the pH of neutral solution? (log 55 = 1.74) (NEET 2013)
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…