List of top Chemistry Questions

The formation of the oxide ion $O^{2-}(g)$ requires first an exothermic and then an endothermic step as shown below $O\left(g\right) + e^{-}O^{-} \left(g\right)?H^{\circ} = -142kJmol^{-1}$ $O^{-} \left(g\right) + e^{-}O^{2-} \left(g\right)?H^{\circ} = 844kJmol^{-1}$

Which of the following is called Marsh gas?

Which of the following is not a characteristic of chemisorption ?

Which of the following is not a synthetic fibre?

Which of the following is the chief ore of copper?

Which of the following reagent can distinguish between $1$-Butyne and $2$-Butyne?

Which of the following will not form a yellow precipitate on heating with an alkaline solution of iodine?

Which one of the following statements about the zeolites is false ?

Which carbon is more electronegative?

Ionic radii are

Which of the following is not a function of proteins?

Which of the following is not considered as an organometallic compound ?

Which one of the following ores is best concentrated by froth - floatation method?

An ideal gas expands in volume from $1?10^{-3} m^3$ to $1?10^{-2} m^3$ at $300\, K$ against a constant pressure of $1?10^5\, Nm^{-2}$. The work done is

Which of the following sets of quantum numbers is correct for an electron in 4f orbital?

As the temperature is raised from $20^{\circ}C$ to $40^{\circ}C$, the average kinetic energy of neon atoms changes by a factor of which of the following?

The standard reduction potential $E^{o}$ for the half reactions are as: $Z n \rightarrow Z n^{2+}+2 e^{-}, E^{o}=0.76\, V$ $C u \rightarrow C u^{2+}+2 e^{-}, E^{o}=0.34\, V$ The emf for the cell reaction: $Z n+C u^{2+} \rightarrow Z n^{2}+C u$

Arrange the following as increase in oxidation number : (i) $Mn ^{2+}$ (ii) $MnO _{2}$ (iii) $KMnO _{4}$ (iv) $K _{2} MnO _{4}$

The number of lattice arrangements in different crystal systems are:

If $20 \,g$ of a solute was dissolved in $500 \,mL$ of water and osmotic pressure of the solution was found to be $600\, mm$ of $Hg$ at $15^{\circ} C$, then molecular weight of the solute is:

The number of sodium atoms in $2$ moles of sodium ferrocyanide is:

According to Bohr's principle, the relation between principle quantum number $(n)$ and radius of orbit is :

The state of hybridisation of $B$ in $ BC{{l}_{3}} $ is:

Which is more acidic ?

Sucrose, a common sugar, is composed of