List of top Chemistry Questions

Choose the incorrect statement.
The group number of the element in the periodic table with the electronic configuration $(n - 1)d^2 ns^2$. For $n = 4$ is:
Identify the final product formed during the course of the given reactions.
% Reaction given Pentan-2-one $\xrightarrow{\text{NaCN/HCl}} [X] \xrightarrow{\Delta, 95% H_2SO_4} [Y]$

Match the items in Column I with their description in Column II:

Which one of the following will give a positive result when it is warmed with Chloroform and alcoholic solution of KOH?
Choose the incorrect statement:
Para and ortho hydrogen differ in:

Identify the reagents X, Y and Z used to bring out the following reactions.

The conversion of Propyne to Benzene can be brought out in 4 steps.
Choose the reagents to be used, in the proper sequential order, to bring out the conversion.
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?

Match the details given in Column I with those given in Column II:

What is the mole fraction of solute in a 5 m aqueous solution?
From among the following, identify the compound which forms two moles of a ketone on ozonolysis.

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

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$_x$
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?
Identify the correct IUPAC name of [CoCl$_2$(NO$_2$)(NH$_3$)$_3$]
Select the strongest base from the given compounds:
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 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.
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.

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

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 __________