List of top Chemistry Questions

The oxidation number of oxygen in peroxides is __.
What is the oxidation number of sulfur in sulfuric acid (H$_2$SO$_4$)?
Which of the following elements has the highest electronegativity?
The IUPAC name of glyoxal is:

The solubility of BaSO4 is 1.1 × 10-5 mol/L. What is its Ksp?

An aqueous solution of CuSO4 is electrolyzed using platinum electrodes.
Which of the following will be observed at the cathode?
Which of the following compounds will exhibit hydrogen bonding?
What is the standard electrode potential for the reduction half-reaction \( \text{Cu}^{2+} + 2e^- \rightarrow \text{Cu} \)?
Which of the following is an example of an alkene?
What is the enthalpy change (\( \Delta H \)) for an exothermic reaction?
What is the pH of a 0.01 M solution of hydrochloric acid (HCl)?
What is the ideal gas law equation?
The enthalpy of vaporization of water is 40.79 kJ/mol. How much heat is required to vaporize 2 moles of water at its boiling point?
A solution is formed by mixing chloroform (CHCl3) and acetone (CH3COCH3).
Which of the following is true regarding the nature of this solution?
The rate constant of a first-order reaction is \( 2 \times 10^{-3} \, \text{s}^{-1} \). What is the half-life of the reaction?
Which of the following compounds exhibits ionic bonding?
Which of the following compounds will have the highest boiling point?
Which of the following is the correct order of increasing atomic size?
Which of the following gases is most likely to deviate from ideal gas behavior at high pressures and low temperatures?
What is the molarity of a solution that contains 0.5 mol of NaCl in 250 mL of solution?
What is the oxidation state of sulfur in \( \text{H}_2\text{SO}_4 \)?
In the electrolysis of molten NaCl using inert electrodes, what will be observed at the electrodes?
0.5 g of an organic compound gives 1.46 g CO\(_2\) and 0.9 g H\(_2\)O. Find the percentage composition of carbon.
On combustion of 0.21 g of an organic compound containing C, H, and O, it gave 0.127 g of H$_2$O and 0.307 g of CO$_2$. The percentage of H and O in the given organic compound respectively are:

In which of the following reactions, major product is matched correctly?