List of top Chemistry Questions

The osmotic pressure of 0.2 molar solution of urea at 300 K (R = 0.082 litre atm $mol^{-1} K^{-1})$ is
The order of size of nucleus and Bohr's radius of an atom respectively are
The ore of aluminium is
The order of stability of free radical is
The order of reactivity of $CH_{3}CHO, CH_{3}COC_{2}H_{5}$ and $CH_{3}COCH_{3}$ is
The order of reactivity of various alkyl halides towards nucleophilic substitution follows the order
The order of reactivity of the following alcohols with halogen acids is
The order of rate of hydrolysis of alkyl halides: $1^{\circ}, 2^{\circ}, 3^{\circ}$ and $CH_3X$ by $S_N2$ pathway is
The order ionization energies of different orbital is
The order HF < HCl < HBr < Hl corresponds to which of the following properties ?
The orbital configuration oi $_{24}Cr$ is $3d^5 4s^1$. The number of unpaired electrons in $Cr^{3+} (g)$ is
The only oxidation state of alkali metals in their compounds is
The one which does not show variable valency is
The oil used in the floatation method for the purification of ores is
The octahedral voids in a face-centred cubic (fee or ccp) structure are located at
The numerical value of universal gas constant (R)depends upon
The number of vacant orbitals in the valence shell of phosphorus is
The number of unpaired electrons in gaseous species of $Mn^{3+}$, $Cr^{3+}$ and $V^{3+}$ respectively are_____and the most stable species is_____.
The number of structural isomers of $C_3H_9N$ are
The number of $sp^2-s$ sigma bonds in benzene are
The number of radial nodes and angular nodes for d-orbital can be represented as
The number of P-O-H and P-H bonds in orthophosphorus acid molecule are relatively
The number of P-O-H links in orthophosphoric acid molecule is
The number of neutrons in 1.8 g of water will approximately be
The number of molecules in 100m L of 0.02N $H_2SO_4$ is