List of top Chemistry Questions

$KF$ combines with $HF$ to form $KHF_2$. The compound contains the species:

The molecular electronic configuration of $Be_2$ is:

Which of the following silver salts is insoluble in water ?

For the reaction (at $1240 \,K$ and $1$ atm.) $ CaCO_3 (s) \rightarrow CaO(s) + CO_2 (g) $ $\Delta H = 176 \, kJ/ mol; \Delta E$ will be :

Which of the following is deliquescent ?

Dacron is polymer of :

Among the following sets of quantum numbers. Which one is incorrect for $4d$ electron ?

Charles' law is represented mathematically as :

Cyanohydrin of which of the following forms lactic acid:

Incorrect statement for pyrophosphorus acid $H_4P_2O_5$ is :

, A will have configuration :

A radioactive isotope has a half life of $10$ days. If today $125$ mg is left over, what was its original weight $40$ days earlier ?

H₂S gas when passed through a solution of cations containing HCl precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because:

The correct order of acid strength is

What is the correct relationship between the pH_s of isomolar solutions of sodium oxide (pH₁),sodium sulphide (pH₂),sodium selenide (pH₃) and sodium telluride (pH₄)?

The correct order in which the O—O bond length increases in the following is:

Which of the following molecules has trigonal planar geometry?

Names of some compounds are given. Which one is not correct in IUPAC system ?

The major organic product formed from the following reaction:

Which one of the following pairs represents stereoisomerism ?

At 25°C,the dissociation constant of a base, BOH, is 1.0 x 10^-12. The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be:

The main reason for larger number of oxidation states exhibited by the actinides than the corresponding lanthanides, is :

The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270kg of aluminum metal from bauxite by the Hall process is: (Atomic mass Al = 27)

Aniline in a set of reactions yielded a product D.
 

The structure of the product D would be: