List of top Chemistry Questions

Which of the following is an example of pseudo first order reaction?
Which of the following molecules has two sigma ($\sigma$) and two pi ($\pi$) bonds?
0.1 M HCl and 0.1 M H2SO4 each of volume 2 mL are mixed and the volume is made up to 6 mL by adding 2 mL of 0.01 N NaCl solution. The pH of the resulting mixture is
The molar enthalpy of vaporization of water at 1 bar and $100^\circ$C is 41 kJ mol$^{-1}$. What is the internal energy change when 1 mol of water is vaporized at 1 bar pressure and $100^\circ$C? Assume water vapor as a perfect gas. (R = 8.3 J K$^{-1}$ mol$^{-1}$)
Why is bromine atom of bromoethane more reactive than that of bromobenzene? Write only chemical equation of the reaction of bromoethane with \( Na \) in presence of dry ether.

Explain the importance of coordination compounds.

Octet rule is obeyed in
The element with atomic number 111 was first named as Unununnium. What is its IUPAC name?
Write different resonating structures of aniline.
For the reaction \( \frac{1}{2} A \rightarrow 2B \), rate of dissociation of \( A \) and rate of formation of \( B \) is related as follows:
What is the effect of catalyst on the rate of reaction? A first-order reaction is 40\% completed in 50 minutes. Calculate the time taken for 80\% completion of the reaction. (Given: \(\log 2 = 0.3010\) and \(\log 6 = 0.7782\))
Define molal depression constant. Calculate the freezing point of the aqueous solution containing 25 g of ethylene glycol (C\(_2\)H\(_6\)O\(_2\)) in 300 g of water. The value of molal depression constant for water is 1.86 K kg mol\(^{-1}\) and freezing point of water is 273.15 K.
Explain the difference between molecularity and order of reaction. Show that the time taken to complete three-fourth of the first-order reaction is doubled to its half-life.
Write a short note on denaturation of proteins.
2.82 g of glucose (molar mass = 180 g mol\(^{-1}\)) is dissolved in 30 g of water. Calculate the molality of the solution.
What is osmotic pressure? Explain the difference between osmosis and diffusion with an example.
Describe the mechanism of bimolecular nucleophilic substitution reactions (\( S_N2 \)) in haloalkanes.
Explain the acidic nature of phenol.
Discuss the method of preparation of potassium dichromate from chromite ore and write the structural formula of dichromate ion.
Which of the following ligands can act as an ambidentate ligand?
In which of the following compounds, oxidation number of Mn is +6?
Which of the following gives isocyanide test?
In nucleic acids, the nucleotides are linked together by
The colligative property is
Effect of temperature on rate of reaction and calculation of time for 80\% completion.