List of top Chemistry Questions

In aluminothermic process, aluminium acts as :

In alumino thermite process which of the following is reduced :

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

In AgBr, there can occur

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

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

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 :

If X is a member of chalcogen family, the chemicalhighest stability of $X^{2-}$ is exhibited by

If x g of a metal forms y g of metal chloride, equivalent weight of metal is

If we plot volume of a certain mass of a gas against temperature at constant pressure, we get a straight line intersecting on the negative side at $ -273^{\circ}C$ which explains about absolute zero. This graph is known as

If volume occupied by $CO_2$ molecules is negligible, then what will be the pressure $\left(\frac{p}{5.277}\right)$ exerted by one mole of $CO_{2}$ gas at $300\, K$? $\left(a = 3.592 atm L^{2} mol^{2}\right)$

If travelling at same speeds, which of the following matter waves have the shortest wavelength?

If the velocity of an electron in Bohr?? first orbit is $2.19 \times 10^6\, m\, s^{-1}$, what will be the de Broglie wavelength associated with it?

If the standard electrode potential of $Cu^{2+}/ Cu$ electrode is 0.34 V, what is the electrode potential of 0.01 M concentration of $Cu^{2+}$?(T = 298 K)

If the position of an electron is known to be within $10^{-12}$ m, then uncertainty in its momentum is

If the ionisation energy of hydrogen atom is $13.6\,eV$, the energy required to excite it from ground state to the next higher state is approximately

If the general formula for aldehyde is written as ${C_n H_{2n+1}CHO}$, the value of n for isobutyraldehyde is

If spheres of radius $'r'$ are arranged in ccp fashion (ABCABC.....), the vertical distance between any two consecutive A layers is