19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The solubility of LiOH in a solution with pH = 8 is (Ksp = 1.8 × 10–12)
Assertion (A): pH of HCl solution is less than that of acetic acid of the same concentration. Reason (R): In equimolar solutions, the number of titrable protons present in HCl in less than that present in acetic…
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
The pH of 10–5 M HCl solution if 1 ml of it is diluted to 1000 ml is :
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 added t…
Which pair of reagents, mixed in the appropriate proportion, could make a buffer in pH 3-4 range ?
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)
How many milliliters (mL) of a 0.0500 M NaOH (a strong base) solution should be added to 1.00 L of 0.100 M H₃PO₄, solution to produce a buffer of pH = 2.00 ? For H₃PO₄, a K = 6.67 × 10–3 Given: H PO …
H S aq H aq HS aq ;K 9.5 10 x HS aq H aq S aq ;K 1.0 10 x Given the equilibrium constants provided what is the equilibrium constant for the reaction: S (aq) 2H (aq) H S(aq) K = ?
The correct order of increasing [H₃O⁺] in the following aqueous solution is:
Calculate the concentration of H⁺ ion in mol/L of 0.010M solution of NH₄Cl? (Kb = 1.8 × 10–6)
Ksp of Mg (OH)₂ is 1 × 10–12. 0.01 M Mg (OH)₂ will be precipitating at the limiting pH :
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…
Assertion (A): H₂SO₄ acts as a base in the presence of HClO₄. Reason (R): Perchloric acid is stronger acid than H₂SO₄.
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: pH of water increases with an increase in temperature. Reason: Kw of water increases with increase in temperature.
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: 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…
Which of the following reaction produces hydrogen?
Match the column I with column II and mark the appropriate choice. Column I Column II (A) Clark’s method (i) Na₆P₆O₁₈ (B) Calgon’s method (ii) NaAlSiO₄ (C) Ion-exchange method (iii) RSO₃H (D) Synthetic resins method (…
Consider the following statements: 1. Atomic hydrogen is obtained by passing hydrogen through an electric arc. 2. Hydrogen gas will not reduce heated aluminium oxide. 3. Finely divided palladium absorbs large volume o…
Match the column I with column II and mark the appropriate choice. Column I Column II (A) NaH (i) Interstitial hydride (B) CH₄ (ii) Molecular hydride (C) VH₀.56 (iii) Ionic hydride (D) B₂H₆ (iv) Electron-deficient hyd…
The molecular formula of a commercial resin used for exchanging ions in water softening is C₈H₇SO₃Na (Mol. wt. 206). What would be the maximum uptake of Ca²⁺ ions by the resin when expressed in mole per gram resin?
Match the column I with column II and mark the appropriate choice. Column I Column II (A) Syngas (i) Na₆P₆O₁₈ (B) Calgon (ii) NaAlSiO₄ (C) Permutit (iii) CO + H₂ (D) Producer gas (iv) CO + N₂
During hydrate formation from aqueous solution, water can be associated in different forms. Indicate the wrong combination. (i) Coordinated water – [Cr(H₂O)₆]3+ 3Cl– (ii) Interstitial water – BaCl₂.2H₂O (iii) Hydrogen…