List of top Questions asked in COMEDK UGET

In Young's double slit experiment light of wavelength 500 nm is used to form interference pattern. A uniform glass plate of refractive index 1.5 and thickness 0.1 mm is introduced in the path of one of the interfering beams. The number of fringes that will shift due to this is

The following data was recorded for the decomposition of XY compound at 750K

What is the order of reaction with respect to decomposition of XY?

Given below are 4 reactions. Two of these reactions will give product which is an equimolar mixture of the d and l forms. Identify these 2 reactions. Reactions $ \text{[A]} \quad \text{2-Methylpropene} + \text{HBr} \rightarrow \text{--------} $ $ \text{[B]} \quad \text{But-1-ene} + \text{HBr} \rightarrow \text{--------} $ $ \text{[C]} \quad \text{3-Methylbut-1-ene} + \text{HI} \rightarrow \text{--------} $ $ \text{[D]} \quad \text{3-Phenylpropene} + \text{HBr (Peroxide)} \rightarrow \text{--------} $

200 ml of an aqueous solution contains 3.6 g of Glucose and 1.2 g of Urea maintained at a temperature equal to 27$^{\circ}$C. What is the Osmotic pressure of the solution in atmosphere units?
Given Data R = 0.082 L atm K$^{-1}$ mol$^{-1}$
Molecular Formula: Glucose = C$_6$H$_{12}$O$_6$, Urea = NH$_2$CONH$_2$

Identify the final product [D] formed when Benzyl alcohol undergoes the following series of reactions: $ C_6H_5CH_2OH + SOC_2 \rightarrow [A] \quad + \quad KCN \rightarrow [B] \quad + \quad H_2O^+ (\text{partial hydrolysis}) \rightarrow [C] \quad + \quad [D] $

Identify the products C, D, and F formed in the following sets of reactions.

5.0 moles of an Ideal gas at 3.0 atm pressure and 27$^\circ$C is compressed isothermally to half its volume by application of an external pressure of 3.5 atm. What is the amount of work done (in joules) on the gas? Given: 1 L atm = 101.3 J, R = 0.082 L atm K$^{-1}$ mol$^{-1}$
In the presence of a catalyst at a given temperature of 27$^\circ$C, the Activation energy of a specific reaction is reduced by 100 J/mol. What is the ratio between the rate constants for the catalysed ($k_2$) and uncatalysed ($k_1$) reactions?

Which one of the following is the correct order of reagents to be used to convert [A] to [X]?

Given:
$\Delta H_f^\circ \, \text{CO}_2 (g) = -393.5 \, \text{kJ/mol}$
$\Delta H_f^\circ \, \text{H}_2\text{O}(l) = -286 \, \text{kJ/mol}$
$\Delta H_f^\circ \, \text{C}_3\text{H}_6(g) = +20.6 \, \text{kJ/mol}$
$\Delta H^\circ_{\text{isomerization of Cyclopropane to Propene}} = -33 \, \text{kJ/mol}$
What is the standard enthalpy of combustion of Cyclopropane?
Given below are 4 statements. Two of these are correct statements. Identify them.
A current of 3.0 A is passed through 750 ml of 0.45 M solution of CuSO₄ for 2 hours with a current efficiency of 90\%. If the volume of the solution is assumed to remain constant, what would be the final molarity of CuSO₄ solution?
Sulphuric acid used in Lead Storage battery has a concentration of 4.5 M and a density of 1.28 g/ml. The molality of the acid is __________.
The Lanthanoid ion which would form coloured compounds is ------------.
Atomic numbers: Yb = 70, Lu = 71, Pr = 59, La = 57
A solute X is found to exist as a dimer in water. A 4 molal solution of X shows a boiling point of 101.04$^\circ\text{C}$. What is the percentage association of X? (K_b for water = 0.52 K/m).
In the redox reaction between $ \text{Cr}_2\text{O}_7^{2-} $ / $ \text{H}^+ $ and sulphite ion, what is the number of moles of electrons involved in producing 3.0 moles of the oxidised product?
For a reaction $ 5X + Y \to 3Z $, the rate of formation of Z is $ 2.4 \times 10^{-5} \, \text{mol L}^{-1} \text{s}^{-1} $. Calculate the average rate of disappearance of X.
Arrange the compounds A, B, C, and D in the increasing order of their reactivity towards SN$_1$ reaction.
A = C$_6$H$_5$CH$_2$Cl
B = C$_6$H$_5$Cl
C = CH$_2$=CH–Cl
D = CH$_3$–CH$_2$–Cl
What volume of 0.2 M Acetic acid is to be added to 100ml of 0.4M Sodium acetate so that a Buffer solution of pH equal to 4.94 is obtained? (pK$_a$ of CH$_3$COOH = 4.76)

Compounds A and B, having the same molecular formula \( C_4H_8O \), react separately with \( CH_3MgBr \), followed by reaction with dil. HCl to form compounds X and Y respectively. Compound Y undergoes acidic dehydration in the presence of Conc. \( H_2SO_4 \) much more readily than X. Compound Y also reacts with Lucas reagent, much more readily than X, with the appearance of turbidity. Identify X and Y.

A dry cell consists of a moist paste of $ \text{NH}_4\text{Cl} $ and $ \text{ZnCl}_2 $ contained in a Zn casing which encloses a carbon rod surrounded by black $ \text{MnO}_2 $ paste. What is the role of $ \text{ZnCl}_2 $ in it?
Let $ \alpha $ and $ \beta $ be the distinct roots of $ ax^2 + bx + c = 0 $, then $ \lim_{x \to \alpha} \frac{1 - \cos(ax^2 + bx + c)}{(x - \alpha)^2} $ is equal to:
Which of the following 2 compounds exhibit both Geometrical and Structural isomerism?
A = $[Co(NH_3)_4Cl_2]NO_2$
B = $[Co(NH_3)_4Br]SO_4$
C = $[Co(NH_3)_3(NO_2)_2]$
D = $[Cr(H_2O)_6]Cl_3$

What mass of Silver chloride, in grams, gets precipitated when 150 ml of 32% solution of Silver nitrate is reacted with 150 ml of 11% Sodium chloride solution?
Atomic mass in g/mol: Ag = 108, Na = 23, Cl = 35.5, N = 14, O = 16.

Arrange the following compounds in the increasing order of their reactivity when each of them is reacted with chloroethane / anhydrous AlCl₃.