KCET · Chemistry · Ionic Equilibrium
\(K_{a}\) values for acids \(\mathrm{H}_{2} \mathrm{SO}_{3}, \mathrm{HNO}_{2}, \mathrm{CH}_{3} \mathrm{COOH}\) and \(\mathrm{HCN}\) are respectively \(1.3 \times 10^{-2}\), \(4 \times 10^{-4}, 1.8 \times 10^{-5}\) and \(4 \times 10^{-10}\), which of the above acids produces stronger conjugate base in aqueous solution?
- A \(\mathrm{H}_{2} \mathrm{SO}_{3}\)
- B \(\mathrm{HNO}_{2}\)
- C \(\mathrm{CH}_{3} \mathrm{COOH}\)
- D \(\mathrm{HCN}\)
Answer & Solution
Correct Answer
(D) \(\mathrm{HCN}\)
Step-by-step Solution
Detailed explanation
Lower the value of \(K_{a}\), lower will be the acidic strength and stronger will be the conjugate base. Therefore, among the given acids, HCN has the lowest \(K_{a}\) value (i.e. \(4 \times 10^{-10}\) ).
Hence, it is the strongest conjugate base.
Hence, it is the strongest conjugate base.
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Chemistry
- Electrophile that participates in nitration of benzene isKCET 2016 Medium
- Specific conductance of \(0.1 \mathrm{M} \mathrm{HNO}_3\) is \(63 \times 10^{-2} \mathrm{ohm}^{-1} \mathrm{~cm}^{-1}\). The molar conductance of the solution isKCET 2022 Medium
- Gabriel phthalimide synthesis is used in thepreparation of primary amine fromphthalimide,
which of the following reagent isnot used during the process?KCET 2017 Medium - What amount of dioxygen (in gram) contains \( 1.8 \times 10^{22} \) molecules ?KCET 2015 Easy
- The correct arrangement for the ions in the increasing order of their radii isKCET 2014 Easy
- Rate of physical adsorption increases withKCET 2009 Medium
More PYQs from KCET
- The least positive integer \(\mathrm{x}\) satisfying \(2^{2010} \equiv 3 x(\bmod 5)\) isKCET 2010 Medium
- If \(x \cos \alpha+y \sin \alpha=4\) is tangent to \(\frac{x^{2}}{25}+\frac{y^{2}}{9}=1\), then the value of \(\alpha\) isKCET 2011 Hard
- If \( A \) is \( 3 \times 4 \) matrix and \( B \) is a matrix such that \( A^{\prime} B \) and \( B A^{\prime} \) are both defined, then \( B \) is of the
typeKCET 2014 Hard - Which of the following does not belong to Kingdom Monera?KCET 2013 Easy
- A cow is tied to a post by a rope. The cow moves along the circular path always keeping the rope tight. If it describes \(44 \mathrm{~m}\), when it has traced out \(72^{\circ}\) at the centre, the length of the rope isKCET 2009 Easy
- Two beams of red and violet colours are made to pass separately through a prism of \(\mathrm{A}=60^{\circ}\). In the minimum deviation position, the angle of refraction inside the prism will beKCET 2010 Easy