List of top Chemistry Questions

Benzene when treated with Br\(_2\) in the presence of FeBr\(_3\), gives 1,4-dibromobenzene and 1,2-dibromobenzene. Which type of reaction is this?

Ratio of time required for 99% completion vs 90% completion of a first order reaction is:

Which of the following fluid has \(\mathrm{pH}<7\):
Which of the following is a double salt:
Which of the following amines will give most easily \(\mathrm{N}_2\) gas on treatment with \(\mathrm{NaNO}_2 + \mathrm{HCl}\) at 275 K:
The amine which is most basic in gas phase is:
Which among the following is fibrous protein:
Schiff’s base is formed by the reaction of aldehyde with:
When benzene diazonium chloride is treated with ethanol, the product obtained is:
Electrophile used in Kolbe’s reaction is:
Denaturation of alcohol is done by the help of:
The compound which does not react with ammonical silver nitrate solution is:
The coordination number and oxidation number of \(\mathrm{Cr}\) in \(\mathrm{K}\left[\mathrm{Cr}\left(\mathrm{H}_2\mathrm{O}\right)_2\left(\mathrm{C}_2\mathrm{O}_4\right)_2\right]\) are:
For the same metal, same ligands, and metal-ligand distances, the correct relation is:
Optical isomerism is shown by:
How many structural isomers does \(\mathrm{C}_7\mathrm{H}_{16}\) have:
The emf of the cell \(\mathrm{Ni}_{(s)} \left| \mathrm{Ni}^{2+}(0.16 \, \mathrm{M}) \right| \mathrm{Ag}^{+}(0.002 \, \mathrm{M}) \left| \mathrm{Ag}_{(s)} \right.\) is (\(E^0_{\text{cell}} = 1.05 \, \mathrm{V}\)):
Cell constant is equal to:
Benzene on reaction with benzoyl chloride in the presence of anhydrous \(\mathrm{AlCl}_3\) forms:
In which of the following elements the 6d orbital is vacant:
Molecularity of a reaction can be:
Which among the following is not an aromatic species:
Correct order of first ionisation energy of B, In, Ga, and Al is:
Which of the following aldehydes does not form iodoform on heating with $\mathrm{I_2}$ and alkali?

An element has two isotopes having atomic masses 10 and 15 u, respectively. If the percent abundance of lighter isotopes is 80%, then the average atomic mass of the element is: