List of top Chemistry Questions

The $t_{\frac{1}{2}}$ for a zero order reaction at the initial concentration of 6x 10M is one minute at $27^{\circ}C$. The rate constant at $27^{\circ}C$ in mol $dm^{-3}s^{-1}$ is
The radiation corresponding to $3\rightarrow2$ transition of hydrogen atom falls on a metal surface to produce photoelectrons. These electrons are made to enter a magnetic field of $3\times10^{-4}$T. If the radius of the largest circular path followed by these electrons is 10.0 mm, the work function of the metal is close to
The process of converting hydrated alumina into anhydrous alumina is called
The period number in the long form of the periodic table is equal to
The $KE$ of the electron in an orbit of radius $r$ in hydrogen atom is ($e$ = electronic charge)
The formula of azurite is
The entropy change involved in the isothermal reversible expansion of $2$ moles of an ideal gas from a volume of $10\, dm ^{3}$ at $27^{\circ} C$ is to a volume of $100\, dm ^{3}$
The boiling point of $p$-nitrophenol is higher than that of $o$-nitrophenol because
Strongest conjugate base is
Rhombic sulphur dissolves best in
Purification of colloids is done by
Nitrogen shows maximum covalency of $4$ whereas other heavier elements of the group show higher covalency because,
Monovalent sodium and potassium ions, divalent magnesium and calcium ions are found in
Monomers of nylon 2-nylon 6 ar
Molality of $2.5\, g$ of ethanoic acid $ (CH_{3}COOH) $ in $75\, g$ of benzene is
Maltose is made of the units
$KMnO_4$ in alkaline medium changes to
In presence of acidic medium, $KMnO_4$ converts $H_2S$ into
In O molecule, the formal charge on the central O-atom is
In electrorefining of copper some gold is deposited at
In Clemmensen reduction, carbonyl compound is treated with
For $K_4[Fe(CN)_6]$, coordination number and oxidation state are respectively
$C_6H_5OC_2H_5$ reacts with HI to give
Which of the following compounds shows optical isomerism ?
Hose pipe for delivery of petrol at a petrol pump is made up of