List of top Chemistry Questions

In case of alkaline earth metals, the oxidation state of more than two is not observed because

In certain respects, lithium differs from other alkali metals, The main reason for this is

In $ccp$ arrangement the pattern of successive layers can be designated as

In astronomical observations, signals observed from the distant stars are generally weak. If the photon detector receives a total of 3.15 ? $10^{-18} J$ from the radiation of 600 nm, calculate the number of photons received by the detector.

In benzilic acid rearrangement

In aqueous solutions $Eu^{2+}$ acts as

In any subshell, the maximum number of electrons having same value of spin quantum number is

In any natural process

In an antifluorite structure, cations occupy

In an adiabatic expansion of ideal gas

In an alkaline condition $KMnO_4$ reacts as follows :$ {2KMnO_4 + 2KOH -> 2K_2MnO_4 + H_2O + O}$ Its equivalent weight is

In alumino thermite process which of the following is reduced :

In aluminothermic process, aluminium acts as :

In Alum : $ { K2SO4 . Al2(SO4)3. 24H2O}$ Which metal can replace Al

In AgBr, there can occur

In acidic medium, $ {0.1 \, M \, KMno_4}$ may oxidise

In acidic medium, $MnO_4 ^{2-}$

In $ABC$ $ABC$ packing if the number of atoms in the unit cell is $n$ then the number of tetrahedral voids in the unit cell is equal to

In a reversible isothermal process,the change in internal energy is :

In a reaction involving ring substitution of $C_6H_5Y$ the major product is meta isomer. The group Y can be

In a polymer sample, 30% of molecules have a molecular mass of 20,000, 40% have 30,000 and the rest 60,000. What is the weight average molecular mass of the polymer ?

In a hexagonal close packed structure (hcp) of spheres, the fraction of the volume occupied by the sphere is A. In a cubic close packed structure, the fraction is B. The relation for A and B is

In a Daniell cell,

In a chemical change from $ {PCl_3 -> PCl_5}$ thehybrid state of P changes from

If you touch concentrated $ {HNO_3}$ with your finger and immediately wash it with water, then the skin at the place where it came into contact with $ {HNO_3}$ becomes yellow. This is because of :