List of top Chemistry Questions

Which one of the following is an inner orbital complex as well as diamagnetic in behaviour? (At. no. of Zn = 30, Cr = 24, Co = 27, Ni = 28)

The aqueous solution containing which one of the following ions will be colourless?(Atomic no: Sc=21, Fe=26, Ti=22, Mn=25)

Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionization enthalpy?

Which of the following is the electron deficient molecule?

The rate of reaction between two reactants A and B decreases by a factor of 4,if the concentration of reactant B is doubled. The order of this reaction with respect to reactant B is:

The decreasing order of nucleophilicity among the nucleophiles : (A)$CH_{3}\underset{\underset{O}{||}}{C}-O^-$ (B)$CH_3O^-$ (C) $CN^-$

The standard electrode potential is measured by

$ H_2S $ gas when passed through a solution of cations containing $HCl$ precipitates the cations of second group in qualitative analysis but not those belonging to the fourth group. It is because

Gold is extracted by hydrometallurgical process, based on its property

Which of the particles cannot be accelerated?

In blast furnace iron oxide is reduced by

The rate at which a substance reacts depends on its

The correct sequence of increasing covalent character is represented by

Which of the following would have a permanent dipole moment?

A buffer solution has equal volumes of $0.2M \, NH_4OH$ and $0.02\, M \, NH_4 Cl$. The $p^{kb}$ of the base is $5$. The $pH$ is

A radioactive isotope has a half life of $10$ days. If today $125$ mg is left over, what was its original weight $40$ days earlier ?

Alum is a water purifier because it

Ethyl chloride on heating with $AgCN$, forms a compound $'X'$ . The functional isomer of $'X'$ is -

Which of the following pairs of elements cannot form an alloy ?

Which compound is zero valent metal complex ?

Which of these does not influence the rate of reaction?

Equimolar solutions in the same solvent have :

In the reaction $ A(s)+B(g)+$ heat $ \rightleftharpoons 2C(s)+2D(g) $ at equilibrium, pressure of $B$ is doubled to re-establish the equilibrium. The factor by which concentration of $D$ is changed, is:

Which of the following is an inert gas ?

Sucrose molecule is made up of