KCET 2025

\(\text { Match the following with their } \mathrm{pKa} \text { values }\)



Acid
pKa


(I) Phenol
(a) 16


(II) p-Nitrophenol
(b) 0.78


(III) Ethyl alcohol
(c) 10


(IV) Picric acid
(d) 7.1

Phenol can be distinguished from propanol by using the reagent

\(A \text { and } B \text { respectively are }\)

Ethyl alcohol is heated with concentrated sulphuric acid at 413 K . The major product

Arrange the following compounds in their decreasing order of reactivity towards Nucleop addition reaction.
\(\mathrm{CH}_3 \mathrm{COCH}_3, \mathrm{CH}_3 \mathrm{COC}_2 \mathrm{H}_5, \mathrm{CH}_3 \mathrm{CHO}\)

Oxidation of Toluene with chromyl chloride followed by hydrolysis gives Benzaldehyde. This reaction is known as ____________

The number of orbitals associated with ' N ' shell of an atom is

According to the Heisenberg's Uncertainty principle, the value of $\Delta \mathrm{b} . \Delta \mathrm{x}$ for an object whose mass is $10^{-6} \mathrm{~kg}$ is $\left(\mathrm{h}=6.626 \times 10^{-34} \mathrm{Js}\right)$

Match List-I with List-II for the following reaction pattern
Glucose $\xrightarrow{\text { Reagent }}$ Product $\longrightarrow$ Structural prediction



List - I (Reagents)
List-II (Structural prediction)


a. Acetic anhydride
i. Glucose h...

The correct sequence of $\alpha$-amino acids, hormone, vitamin, carbohydrates respectively is

Which examples of carbohydrates exhibit $\alpha-$ link, ( $\alpha-$ glycosidic link) in their structure?

Statement - I : Reduction of ester by DIABL-H followed by hydrolysis gives aldehyde.
Statement - II : Oxidation of benzyl alcohol with aqueous $\mathrm{KMnO}_4$ leads to the formation to Benzaldehyde.
Among the above statements, identify th...

Which of the following has most acidic Hydrogen ?

\(\text { Match List-I with List-II and select the correct option: }\)






List-I (Molecule / ion)

List-II (Bond order)







1

.



NO





1

.



NO



1.NO

i. 15







2

.



CO





2

...

The electronic configuration of X and Y are given below:
$$ \begin{aligned} & X: 1 s^2 2 s^2 2 p^6 3 s^2 3 p^3 \\ & Y: 1 s^2 2 s^2 2 p^6 3 s^2 3 p^5 \end{aligned} $$
Which of the following is the correct molecular formula and type of bond f...

The change in hybridization (if any) of the 'Al' atom in the following reaction is $\mathrm{AlCl}_3+\mathrm{Cl}^{-} \rightarrow \mathrm{AlCl}_4^{-}$

Which of the following statements is/are true about equilibrium?
(a) Equilibrium is possible only in a closed system of at a given temperature
(b) All the measurable properties of the system remain constant at equilibrium
(c) Equilibrium co...

According to Le Chatelier's principle, in the reaction $\mathrm{CO}(\mathrm{g})+3 \mathrm{H}_2(\mathrm{~g}) \rightleftharpoons \mathrm{CH}_4(\mathrm{~g})+\mathrm{H}_2 \mathrm{O}(\mathrm{g})$, the formation of methane is favoured by
(a) Incr...

The equilibrium constant at 298 K for the reaction $\mathrm{A}+\mathrm{B} \rightleftharpoons \mathrm{C}+\mathrm{D}$ is 100 . If the initial concentrations of all the four species were 1 M each, then equilibrium concentration of D (in $\math...

Catalysts are used to increase the rate of a chemical reaction. Because it

Half-life of a first order reaction is 20 seconds and initial concentration of reactant is 0.2 M . The concentration of reactant left after 80 seconds is

For the reaction $2 \mathrm{~N}_2 \mathrm{O}_{5(\mathrm{~g})} \rightarrow 4 \mathrm{NO}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})}$ initial concentration of $\mathrm{N}_2 \mathrm{O}_5$ is $2.0 \mathrm{molL}^{-1}$ and after 300 min , it is...

\(\text { In the given graph, } \mathrm{E}_{\mathrm{a}} \text { for the reverse reaction will be }\)

Which of the following reagents are suitable to differentiate Aniline and N-methylaniline chemical

\(\text { Which of the following reaction/s does not yield an amine? }\)

\(\text { Match the compounds given in List - I with the items given in List - II. }\)






List - I

List - II





(I) Benzenesulphonyl Chloride

(a) Zwitterioin





(II) Sulphanilic acid

(b) Hinsberg reagent





(III) Alkyl Diazoni...

A ligand which has two different donor atoms and either of the two ligates with the central metal atom/ion in the complex is called ___________

\(\text { Which formula and its name combination is incorrect? }\)

\(\text { In the complex ion }\left[\mathrm{Fe}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-} \text {, the co-ordination number of } \mathrm{Fe} \text { is }\)

Which of the following statements are true about $\left[\mathrm{NiCl}_4\right]^{2-}$ ?
(a) The complex has tetrahedral geometry
(b) Co-ordination number of Ni is 2 and oxidation state is +4
(c) The complex is $\mathrm{sp}^3$ hybridised
(d) ...

In the following pairs, the one in which both transition metal ions are colourless is

A member of the Lanthanoid series which is well known to exhibit +4 oxidation state is

In which of the following pairs, both the elements do not have $(n-1) d^{10} n s^2$ configuration?

The correct statement/s about Galvanic cell is/are
(a) Current flows from cathode to anode
(b) Anode is positive terminal
(c) If $\mathrm{E}_{\text {cell }}<0$, then it is spontaneous reaction
(d) Cathode is positive terminal

The electronic conductance depends on

For a given half cell, $\mathrm{Al}^{3+}+3 \mathrm{e}^{-} \rightarrow \mathrm{Al}$ on increasing of aluminium ion, the electrode potential will

Match the following select the correct option for the quantity of electricity, in $\mathrm{Cmol}^{-1}$ required to
deposit various metals at cathode
$$
\begin{array}{|l|l|l|l|}
\hline & \text { List - I } & & \text { List- II } \\
\hline \...

\(\text { Which of the following is not an aromatic compound }\)

Chlorobenzene reacts with bromine gas in the presence of Anhyd $\mathrm{AlBr}_3$ to yield p-Bromochlorobenzene. This reaction is classified as ____________

The organometallic compound $\left(\mathrm{CH}_3\right)_3 \mathrm{CMgBr}$ on reaction with $\mathrm{D}_2 \mathrm{O}$ produces $\qquad$

The major product formed when $1-$ Bromo $-3-$ Chlorocyclobutane reacts with metallic sodium in dry ether is

\(\text { Among the following, identify the compound that is not an isomer of hexane }\)

The IUPAC name of the given organic compound is
\(\mathrm{HC} \equiv \mathrm{C}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}_2\)

Among the following 0.1 m aqueous solutions, which one will exhibit the lowest boiling point elevation, assuming complete ionization of the compound in solution?

180 g of glucose, $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6$, is dissolved in 1 kg of water in a vessel. The temperature at which water boils at 1.013 bar is _________ (given, $\mathrm{K}_{\mathrm{b}}$ for water is $052 \mathrm{~K} \mathrm...

If $N_2$ gas is bubbled through water at 293 K , how many moles of $N_2$ gas would dissolve in 1 litre of water? Assume that $\mathrm{N}_2$ exerts a partial pressure of 0.987 bar.
[Given $\mathrm{K}_{\mathrm{H}}$ for $\mathrm{N}_2$ at 293 K...

Variation of solubility with temperature t for a gas in liquid is shown by the following graphs. The correct representation is

\(\text { Given below and the atomic masses of the elements: }\)
$$ \begin{array}{|l|l|l|l|l|l|l|l|l|l|} \hline \text { Element: } & \mathrm{Li} & \mathrm{Na} & \mathrm{Cl} & \mathrm{~K} & \mathrm{Ca} & \mathrm{Br} & \mathrm{Sr} & \mathrm...

In the preparation of sodium fusion extract, the purpose of fusing organic compound with a piece of sodium metal is to