List of top Chemistry Questions asked in COMEDK UGET

A proton having mass equal to \(1.66 \times 10^{-27}\) kg is accelerated to one tenth of the velocity of light. If its velocity can be measured to an accuracy of \(\pm 2%\), what would be the uncertainty in its position?
Para and ortho hydrogen differ in:
Identify the correct IUPAC name of [CoCl$_2$(NO$_2$)(NH$_3$)$_3$]
From among the following, identify the compound which forms two moles of a ketone on ozonolysis.
The equilibrium constants for the reactions a, b, and c are as given:
a) N$_2$ + 3H$_2$ = 2NH$_3$ : K$_1$
b) N$_2$ + O$_2$ = 2NO : K$_2$
c) 2H$_2$ + O$_2$ = 2H$_2$O : K$_3$
What would be the equilibrium constant for the reaction:
4NH$_3$ + 5O$_2$ = 4NO + 6H$_2$O; K$_x$
Select the strongest base from the given compounds:
If electrolysis of water is carried out for a time duration of 2 hours, how much electric current in amperes would be required to liberate 100 ml of O\(_2\) gas measured under standard conditions of temperature and pressure?

For a reaction of the type, \( 2X + Y \rightarrow A + B \), the following is the data collected:

The Molar conductivity of 0.05M solution of MgCl$_2$ is 194.5 ohm$^{-1}$ cm$^2$ per mole at room temperature. A Conductivity cell with electrodes having 3.0 cm$^2$ surface area and 1.0 cm apart is filled with the solution of MgCl$_2$. What would be the resistance offered by the conductivity cell?
What would be the volume of water required to dissolve 0.2 g of PbCl$_2$ of molar mass 278 g/mol to prepare a saturated solution of the salt? (K$_{sp}$ of PbCl$_2$ = 3.2 $\times$ 10$^{-8}$)
In neutral medium KMnO$_4$ oxidises MnSO$_4$ to __________
Which one of the following compounds would not undergo Aldol condensation?
Gaseous Nitrous oxide decomposes at 298 K to form Nitrogen gas and Oxygen gas. The \(\Delta H \text{ for the reaction at 1.0 atm pressure and 298 K is } \)-163.15 \(\text{ kJ}\). Calculate Internal energy change for the decomposition of 100 g of Nitrous oxide gas under the same conditions of temperature and pressure.
What would be the van't Hoff factor for a solution prepared by dissolving 3.42 g of CaCl$_2$ in 2500 ml of water having an Osmotic pressure equal to 0.75 atm at 27°C? Molar mass of CaCl$_2$ = 111 amu.

Match the following characteristics of transition metals given in Column I with the examples listed in Column II:

5.8 g of a gas maintained at 95\(^\circ C\) occupies the same volume as 0.368 g of hydrogen gas maintained at a temperature of 17\(^\circ C\) and pressure being the same atmospheric pressure for both the gases. What is the molecular mass of the unknown gas?
Identify the starting compound from the following data: \[ C_6H_{14}O(X) \text{ on reaction with HI yields a haloalkane (A) and an alcohol (B).} \] Compound (A) on reaction with aqueous NaOH gives an alcohol (C). Compounds (B) and (C) on reaction with CrO\(_3\) in anhydrous medium yields Butanone and Ethanal respectively.
A first order reaction proceeds to 90% completion. What will be the approximate time taken for 90% completion in relation to \(t_{1/2}\) of the reaction?

Pick out the incorrect statement(s) from the following.

1.  Glucose exists in two different crystalline forms, \( \alpha \)-D-glucose and \( \beta \)-D-glucose.
2.  \( \alpha \)-D-glucose and \( \beta \)-D-glucose are anomers.
3.  \( \alpha \)-D-glucose and \( \beta \)-D-glucose are enantiomers.
4.  Cellulose is a straight chain polysaccharide made of only \( \beta \)-D-glucose units.
5.  Starch is a mixture of amylase and amylopectin, both contain unbranched chain of \(\alpha\)-D-glucose units.

Which of the following is incorrect?

Rank the following compounds in order of increasing basicity.

Ammoniacal silver nitrate forms a white precipitate easily with
Consider the following equilibrium, $$ 2 \text{NO}(g) \rightleftharpoons \text{N}_2 (g) + \text{O}_2 (g); K_1 = 2.4 \times 10^{20} $$ $$ \text{NO}(g) + \frac{1}{2} \text{Br}_2 (g) \rightleftharpoons \text{NOBr}(g); K_2 = 1.4 $$ Calculate $ K_C $ for the reaction, $$ \frac{1}{2} \text{N}_2 (g) + \frac{1}{2} \text{O}_2 (g) + \frac{1}{2} \text{Br}_2 (g) \rightleftharpoons \text{NOBr}(g) $$
Which of the following is incorrect regarding Henry's law?
t-butyl chloride preferably undergo hydrolysis by