List of top Chemistry Questions

The four quantum numbers of the valence electron of potassium are :

Electronic configuration of $ {{S}^{2-}} $ ion is :

Which of the following has magic number of protons and neutrons?

Among the following compounds, the strongest acid is

Which of the following has the highest first ionization potential?

Which of the following species has the highest ionization potential ?

Hydrolysis of acetonitrile in acid medium gives:

The first ionisation potential (in eV) of Be and B, respectively are

Which one of these, is not compatible with arenes?

At the critical micelle concentration (CMC) the surfactant molecules

An aqueous solution of sodium carbonate absorbs NO and $NO_2$ to give

Phenol gives_______colour with neutral \(FeCl_3\) solution

The vapour pressure of a solvent decreased by 10 mm o f mercury when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent if the decrease in the vapour pressure is to be 20 mm o f mercury?

IUPAC name of $\left[ Pt \left( NH _{3}\right)_{3}( Br )\left( NO _{2}\right) Cl \right] Cl$ is

Acetic acid reacts with $PCl_5$ to form

Which of the following has highest first ionization potential ?

Aniline is reacted with bromine water and the resulting product is treated with an aqueous solution of sodium nitrite in presence of dilute hydrochloric acid. The compound so formed is converted into a tetrafluoroborate which is subsequently heated. The final product is

Aspirin is an acetylation product of

A device, in which electrical energy is converted into chemical energy, is called:

The second order Bragg diffraction of X-rays with $\lambda = 1.0 \mathring{A}$ from a set of parallel planes in a metal occurs at an angle $60^\circ$. The distance between the scattering planes in the crystals is

In the reaction, $4NH_3 (g) + 5O_2 \rightarrow 4NO(g) + 6H_2O (I)$ When 1 mole of ammonia and 1 mole of $O_2$ are made to react to completion, then

The Activation energy of a chemical reaction can be determined by

A 5% solution of cane sugar (MW = 342) isisotonic with 1% solution of substance X. The molecular weight of X is

Which one is not paramagnetic among the following? [at. no. of $Be = 4, N e = 10$ , $A s= 33,Cl= 17$]

Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200 g. The number of iron atoms (at. weight of Fe is 56) present in one molecule of haemoglobin are