List of top Chemistry Questions

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 of these does not influence the rate of reaction?

Which compound is zero valent metal complex ?

Equimolar solutions in the same solvent have :

The mole fraction of the solute in one molal aqueous solution is:

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

$15 $ moles of $H_2$ and $5.2$ moles of $I_2$ are mixed and allowed to attain equilibrium at $500^\circ$C. At equilibrium, the concentration of $HI$ is found to be $10$ moles. The equilibrium constant for the formation of $HI$ is

The number of $P - O - P$ bridges in the structure of phosphorus pentoxide and phosphorus trioxide are respectively

The energy band gap is maximum in:

Total number of atoms represented by the compound $CuSO_4 . 5H_2O$ is

In a set of reactions, acetic acid yielded a product D.
CH₃COOH \(\xrightarrow[]{SOCl_2}\) A \(\xrightarrow[Anhyd.AlCl_3]{Benzene}\) B \(\xrightarrow[]{HCN}\) C \(\xrightarrow[]{HOH}\) D
The structure of D would be:

Two forms of D-glucopyranose, are called

Products of the following reaction:

A solution has a 1:4 mole ratio of pentane to hexane. The vapour pressure of the pure hydrocarbons at 20°C are 440 mm of Hg for pentane and 120 mm of Hg for hexane. The mole fraction of pentane in the vapour phase would be

The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270kg of aluminum metal from bauxite by the Hall process is: (Atomic mass Al = 27)

The surface tension of which of the following liquid is maximum

The vapour pressure of two liquids P and Q are 80 and 60 torr, respectively. The total vapour pressure of solution obtained by mixing 3 moles of P and 2 moles of Q would be: