List of top Chemistry Questions

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

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

$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:

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:

Phenol and benzoic acid are distinguished by:

Alkyl halides react with dialkyl copper reagents to give

Which of the following gives propyne on hydrolysis?

Aluminium oxide may be electrolysed at 1000 $^{\circ}$C to furnish aluminium metal (Atomic mass = 27 amu: 1 faraday = 96,500 Coulombs). The cathode reaction is $Al^{3+} + 3e^- \to Al^{\circ}$ To prepare 5.12 kg of aluminium metal by this method would require :

The salt soluble in excess of sodium hydroxide solution is

Concentrated nitric acid with aluminium gives