COMEDK 2025 Afternoon Shift

Two statements, One Assertion and the other Reason, are given.
Which one of the following is the correct option?
Assertion: The acid strength of 4 compounds in the descending order is p- Nitrophenol > p-Methoxyphenol > Phenol > p-chlorophen...

Which one of the following compounds will give a yellow precipitate when reacted with $\mathrm{I}_2 / \mathrm{NaOH}$?

Which one of the following is the major product formed when the given reaction occurs?

Complete the following 2 reactions A & B by choosing appropriate reactants $[\mathrm{X}] &[\mathrm{Y}]$.

Match the reaction in Column I with the major product formed given in Column II.

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Choose the incorrect statement.

An organic compound " A " reacts with $\mathrm{Zn} / \mathrm{Hg}$ / Conc. HCl to form p-Xylene. It reduces Tollen's reagent and on oxidation with $\mathrm{KMnO}_4 / \mathrm{H}^{+}$it yields 1, 4-benzenedicarboxylic acid.
Identify compound A...

Two subatomic particles 1 and 2, with the same kinetic energies have their de- Broglie wavelengths as $\lambda_1 & \lambda_2$ and masses as 3 m and 6 m respectively.

Determine the ratio $\lambda_1: \lambda_2$.

Match A, B, C and D with the appropriate functions given.

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Which one of the following is the correct statement?

Identify X and Y formed in the following two reactions.
(i) Decan-1-ol $\xrightarrow{\text { Jones reagent }} \mathrm{X}$
(ii). Sodium salt of $\mathrm{X} \xrightarrow{\mathrm{NaOH} / \mathrm{CaO}, \Delta} \mathrm{Y}$

Choose the incorrect statement from the following.

Given are 4 pairs of covalent molecules. Identify the pair in which both molecules have the same shape.

From among the 4 given compounds identify the compounds which possess a net dipole moment.
A. cis-1,2-Dichloroethene
B. Tetrachloromethane
C. o-Dichlorobenzene
D. trans 2,3-Dibromobut-2-ene

Which one of the following molecules attains greater stability on formation of its diatomic monovalent anion?

For the reaction $\mathrm{P}+\mathrm{Q} \leq \mathrm{R}+\mathrm{S}$, carried out at 298 K , the equilibrium constant was found to be 169 and the initial concentrations of all reactants and products was 1.0 M . What is the equilibrium concen...

The rate constant for a zero order reaction $\mathrm{A} \rightarrow \mathrm{B}+\mathrm{C}$ is $6.0 \times 10^{-3} \mathrm{molL}^{-1} \mathrm{~s}^{-1}$.
What would be the time taken for the initial concentration of A to decrease from 0.2 M t...

Which one of the following is incorrect?

The time needed for completion of $80 \%$ is $y$ times the half-life period of a first order reaction. What is the value of $y$ ?

The hydrogenation of Ethyne is carried out at 600 K . The same reaction when carried out in presence of a catalyst maintaining the same rate constant, the temperature required is only 400 K . If the catalyst lowers the Activation energy of ...

(i) and (ii) are 2 chemical reactions carried out at TK.
(i). $\mathrm{X} \rightarrow \mathrm{Y}+\mathrm{W}$ with $\mathrm{k}_1$ as rate constant.
(ii). $\mathrm{X} \rightarrow \mathrm{Z}+\mathrm{W}$ with $k_2$ as rate constant.
The Activat...

An organic compound $\mathrm{A}\left(\mathrm{C}_5 \mathrm{H}_9 \mathrm{~N}\right)$ upon reaction with $\mathrm{Na} / \mathrm{Hg} / \mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}$ gives compound B .
B reacts with $\mathrm{NaNO}_2 / \mathrm{HCl}$ at 2...

Choose the correct statement:

Identify the product $(\mathrm{Y})$ formed in the given reaction and the name of the reaction where $(\mathrm{X}) \rightarrow(\mathrm{Y})$.

Which one of the following structures in Column I does not have the correct IUPAC name as given in Column II.

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The correct order of spin only magnetic moments among the following is:
[Given: Atomic numbers: $\mathrm{Mn}=25, \mathrm{Fe}=26, \mathrm{Co}=27$ ]

A transition metal M forms 4 homoleptic octahedral coordination compounds, $\mathrm{A}, \mathrm{B}, \mathrm{C}$ and D of the type $\left[\mathrm{MX}_6\right]^{z-}$ with monodentate ligands a, b, c and d respectively. These compounds absorb ...

Choose the coordination compound which does not exhibit Optical activity.

Arrange the following ions in the decreasing order of covalent double bonds formed by the transition metal with oxygen.
A. $=$ chromate
$\mathrm{B}=$ permanganate
$\mathrm{C}=$ dichromate

Larger number of oxidation states are exhibited by the actinoids than those of lanthanoids. The reason is:

Choose the statements which are incorrect in the case of Lanthanoids.
A. $\mathrm{Ce}^{4+}$ is diamagnetic while $\mathrm{Sm}^{3+}$ is paramagnetic.
B. The atomic size of the transition metals having atomic number greater than 71 are very c...

Which is the correct order of increasing number of unpaired electrons in the following ions?
$$\mathrm{A}=\mathrm{Cr}^{2+}(\mathrm{Z}=24) \mathrm{B}=\mathrm{Cu}^{2+}(\mathrm{Z}=29) \quad \mathrm{C}=\mathrm{Ni}^{2+}(\mathrm{Z}=28) \mathrm{D}...

The $E_{M^{3+} / M^{2+}}^o$ values for $\mathrm{Cr}, \mathrm{Mn}, \mathrm{Fe}$ and Co are $-0.41,+1.57,+0.77$ and +1.97 V respectively.
For which of these metals, the change in oxidation state from +2 to +3 is the easiest?

The Standard Reduction potential at $25^{\circ} \mathrm{C}$ for $\left(\mathrm{MnO}_4\right)^{-1} / \mathrm{H}^{+}$is +1.49 V . The $\mathrm{E}^0$ values for four Metal ions :
(a). $\mathrm{Co}^{3+} / \mathrm{Co}^{2+}$
(b). $\mathrm{Cr}^{3+...

Two statements, one Assertion and the other Reason are given. Choose the correct option.
Assertion: For strong electrolytes the plot of Molar conductivity versus Concentration gives a straight line with slope equal to +A and intercept equal...

A current of 1.5 A is passed for 2 hours through an aqueous solution of $\mathrm{PdX} \mathrm{n}_{\mathrm{n}}$ where X is a monovalent anion. During the electrolysis process 2.977 g of Palladium metal gets deposited at the cathode. Calculat...

What is the standard electrode potential at 298 K for the reaction: $\mathrm{Cu}^{2+}+1 \mathrm{e}-\rightarrow \mathrm{Cu}^{+1}$ ?
Given: $\mathrm{E}_0 \mathrm{Cu}^{+1} / \mathrm{Cu}=0.5 \mathrm{~V} \quad & \quad \mathrm{E}_0 \mathrm{Cu}^...

What would be the cell potential for the Galvanic cell which is represented by the electrochemical reaction:

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& 2 \mathrm{Cr}_{(\mathrm{S})}+3 \mathrm{Fe}^{2+}(0.02 \mathrm{M}) \rightarrow 2 \mathrm{Cr}^{3+}(0.2 \mathrm{M...

Two statements, one Assertion and the other Reason are given. Choose the correct option.
Assertion: Heterocyclic compounds like Pyridine and Thiophene are non-aromatic compounds.
Reason: According to Huckel rule for a given compound to exhi...

Choose the incorrect statement from the following.

Identify the incorrect statement.

Toluene when reacted with $\mathrm{Cl}_2$ gas at 385 K forms a product X which undergoes further reaction with Sodium ethoxide to yield product Y . The structure of Y is ___________ .

Identify the reagents to be used to complete the given reaction.

An Alkene " X " on reaction with hot acidified $\mathrm{KMnO}_4$ gave a mixture of Ethanoic acid and Propanone. Identify " X ".

When one mole of a hydrocarbon $\mathbf{C}_{\mathbf{a}} \mathbf{H}_{\mathbf{b}}$ undergoes complete combustion, it requires 7.5 moles of $\mathrm{O}_2$ and results in the production of 6 moles of $\mathrm{CO}_2$. Calculate the values of $\m...

Match the reactions in Column I with the correct products given in Column II

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Imagine an R - moiety of a pentapeptide molecule having one $-\mathrm{SH},-\mathrm{CONH}_2,-\mathrm{NH}_2$ groups each and two $-$COOH groups in the amino acids forming the pentapeptide. If the pH is maintained at 13.2, what would be the to...

The ionisation constant of the weak acid HF whose concentration is 0.1 M is $3.5 \times 10^{-4}$ The Equilibrium constant value for the reaction $\mathrm{F}^{-}+\mathrm{H}_2 \mathrm{O} \leftrightharpoons \mathrm{HF}+\mathrm{OH}^{-}$is _____...

Which of the following is the correct name according to IUPAC rules?

A dilute solution of an ionic compound $\mathrm{A}_3 \mathrm{~B}$ has an Osmotic pressure which is 6 times that of $0.02 \mathrm{M} \mathrm{MgCl}_2$. What is the molar concentration of $\mathrm{A}_3 \mathrm{~B}$ assuming that it undergoes c...