MCQ
Which is the strongest acid ? ($pKa$ value is given in the bracket)
- ✓$HCOOH\,(3.77)$
- B${C_6}{H_5}COOH\,(4.22)$
- C$C{H_3}COOH\,(4.71)$
- D$C{H_3}C{H_2}COOH\,(4.88)$
✓
Answer
Correct option: A.
$HCOOH\,(3.77)$
a
The $\mathrm{pK}_{\mathrm{a}}$ value indicates the strength of an acid. A lower $\mathrm{pK}_{\mathrm{a}}$ value indicates a stronger acid i.e, the lower value indicates the acid more fully dissociates in water.
The $\mathrm{pK}_{\mathrm{a}}$ value indicates the strength of an acid. A lower $\mathrm{pK}_{\mathrm{a}}$ value indicates a stronger acid i.e, the lower value indicates the acid more fully dissociates in water.
: Formic acid with lower $\mathrm{pK}_{\mathrm{a}}$ value of 3.77 is the strongest acid.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The synonym for water gas when used in the production of methanol is :
$I$ and $II$ are geometrical isomers of each other because
→The volume (in $mL$ ) of $0.1\, N$ $NaOH$ required to neutralise $10\, mL$ of $0.1\, N$ phosphinic acid is........
→Purine derivative among the following bases is
Which is the strongest of the following acids
The enthalpy change on freezing of $1\, mol$ of water at $5\,^oC$ to ice at $-5\,^oC$ is .....$ kJ\, mol^{-1}$
→(Given ${\Delta _{fus}}H = 6\, kJ\, mol^{-1}$ at $0\,^oC$,
$C_p(H_2O, l) =75.3\, J\, mol^{-1} \, K^{-1}$ ,
$C_p(H_2O, s) = 36.8\, J\, mol^{-1} \, K^{ -1}$ )
The $IUPAC$ name of the compound having the formula $CH\equiv C-CH=CH_2$ is
→Zinc displaces copper from the solution of its salt because
Silicon dioxide is formed by the reaction of
Solubility curves of four ionic salts $X, Y, Z, W$ are given below
→In which case the value of $\Delta H_{sol.} < 0$