List of top Questions asked in COMEDK UGET

The standard enthalpies of formation of $\mathrm{CH_4(g)}$, $\mathrm{CO_2(g)}$ and $\mathrm{H_2O(l)}$ are $-78$, $-395$ and $-288\ \mathrm{kJ\ mol^{-1}}$ respectively. Calculate $\Delta H$ for: \[ \mathrm{2CH_4(g) + 4O_2(g) \rightarrow 2CO_2(g) + 4H_2O(l)} \] }
An equilibrium mixture taken in 2 litre vessel of the reaction: \[ \mathrm{2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g)} \] has 4 moles of $\mathrm{SO_2}$, 3 moles of $\mathrm{O_2}$ and 6 moles of $\mathrm{SO_3}$ then the value of equilibrium constant $(K_c)$ will be:
A compound [X] (Isopropyl phenyl ether) undergoes reactions as given below. Identify compounds [C] and [D] formed in these reactions.
Identify the final product formed when benzenamine reacts with the given reagents in the sequential order as: (i) $\mathrm{(CH_3CO)_2O}$/Pyridine, (ii) Conc. $\mathrm{HNO_3 + H_2SO_4}$ followed by $\mathrm{H_3O^+}$, (iii) $\mathrm{NaNO_2/HCl}$ (273 K) followed by $\mathrm{H_3PO_2(aq)}$.
Match the reactions in List I with the final products formed as given in List II.
With reference to the two statements Assertion and Reason, choose the correct option.
• [Assertion:] The order of reactivity towards $\text{S}_{\text{N}}1$ reaction is: $\text{C}_6\text{H}_5\text{CH}_2\text{Br} > (\text{CH}_3)_2\text{CH-Br} > \text{CH}_3-\text{CH}_2\text{Br}$
• [Reason:] Among the given 3 compounds, the Benzyl carbocation formed is the most stable while Isopropyl carbocation is the least stable one
At $30^\circ\text{C}$ the solubility of $\text{PbI}_2$ salt in $2\text{ M KI}$ solution will be X, if the solubility product of $\text{PbI}_2$ at $30^\circ\text{C}$ is $4\times10^{-9}$. Identify the value of X.
Using the data given below, the strongest reducing agent is: $E_{\text{Cr}_2\text{O}_7^{2-}/\text{Cr}^{3+}}^\circ = 33\text{ V}$, $E_{\text{Cl}_2/\text{Cl}^-}^\circ = 36\text{ V}$, $E_{\text{MnO}_4^-/\text{Mn}^{2+}}^\circ = 51\text{ V}$, $E_{\text{Cr}^{3+}/\text{Cr}}^\circ = -74\text{ V}$}
The product and its colour when $\text{MnO}_2$ is fused with $\text{KOH}$ in presence of $\text{O}_2$:
$500\text{ mL}$ of an aqueous solution of glucose $\text{C}_6\text{H}_{12}\text{O}_6$ (Molar mass $180\text{ g mol}^{-1}$) contains $02 \times 10^{22}$ molecules. The concentration of the solution will be:
In the redox reaction, taking place in acidic medium: $\text{X MnO}_4^-(aq) + \text{Y SO}_2(g) \rightarrow \text{Mn}^{+2}(aq) + \text{HSO}_4^-(aq)$,} the ratio of X:Y in a stoichiometrically balanced equation will be:
Which of the following statement is correct?
Which of the following is an INCORRECT statement?
The frequency of photon which is emitted during a transition of electron of $\text{He}^+$ ion from fifth energy level to third energy level will be:
The element with the highest third ionisation enthalpy is:
According to Molecular orbital theory, which of the following is correct with respect to bond order?
For an ideal gas undergoing an isothermal change, there is:
Consider the series of reactions given and identify the final product [Z].
Resistance of 2 M solution of an electrolyte is $50\text{ }\Omega$. The conductivity of the solution is $3\text{ S m}^{-1}$. If the resistance of 4 M solution of the same electrolyte is $260\text{ }\Omega$, its molar conductivity is:
Identify the complex which exhibits all 3 characteristics: paramagnetic; high spin configuration; octahedral geometry.
Choose the incorrect statement.
Which one of the following complex-isomerism pair matches correctly?
Which of the following is an INCORRECT match?
An unsaturated organic compound ($\text{C}_3\text{H}_6$), undergoes the following series of reactions: $\text{C}_3\text{H}_6$ $\xrightarrow{\text{dil. H}_2\text{SO}_4}$ [B] $\xrightarrow{\text{+HCl/ZnCl}_2}$ [C] $\xrightarrow{\text{Na / dry ether}}$ [D] (Major Product)} Identify compound [D].
A first order reaction is 50% complete in 30 minutes at 300 K and in 10 minutes at 320 K. The activation energy of the reaction ($E_a$) is: [R = 314 J K$^{-1}$ mol$^{-1}$, log 2 = 3010; log 3 = 4771]