According to the Brønsted-Lowry concept, an acid is a:
- AProton acceptor
- BProton donor
- CElectron pair acceptor
- DElectron pair donor
Which of the following is a conjugate acid-base pair in the reaction HCl + H2O ⇌ H3O+ + Cl-?
- AHCl and H₂O
- BHCl and Cl⁻
- CH₂O and H₃O⁺
- DBoth B and C
According to the Lewis concept, a Lewis acid is a substance that can:
- ADonate a proton
- BAccept an electron pair
- CDonate an electron pair
- DAccept a proton
Which of the following is a Lewis acid?
The ionisation constant of water (Kw) at 25°C is:
- A1.0 × 10-7
- B1.0 × 10-14
- C1.0 × 10-10
- D1.0 × 10-21
The pH of a 0.001 M HCl solution is:
The pH of a 0.062 M NaOH solution is approximately:
In a titration, the end point is indicated by:
- AA change in temperature
- BA colour change of the indicator
- CA change in pressure
- DThe formation of a precipitate
The greater the value of Ka, the:
- AWeaker the acid
- BStronger the acid
- CMore basic the solution
- DLower the pH
Which of the following is the strongest acid based on the given Ka values?
- AHCl (Ka = 1.0 × 106)
- BHF (Ka = 7.2 × 10-4)
- CCH₃COOH (Ka = 1.8 × 10-5)
- DHCN (Ka = 6.2 × 10-10)
