List of top Chemistry Questions

The mass of a non-volatile solute of molar mass $40\, g \,mol^{-1}$ that should be dissolved in $114\, g$ of octane to lower its vapour pressure by $20 \%$ is
The $s$-block element used as a catalyst in the manufacture of Buna-$S$ rubber is
Under identical conditions, the $S_N1$ reaction will occur most efficiently with
$20\, mL\, 0.1( N )$ acetic acid is mixed with $10\, mL$ $0.1( N )$ solution of $NaOH$. The $pH$ of the resulting solution is $\left( p K_{a}\right.$ of acetic acid is $4.74$ )
The state of hybridization of the central atom and the number of lone pairs over the central atom in $POCl_{3}$ are
If the kinetic energy of an electron is increased four times, the wavelength of the de-Broglie wave associated with it would become
EDTA is a hexadentate ligand. Denticity of a ligand is given by number of lone pairs donated to central atom by a ligand.
Which one among the following alcohols will give iodoform on treatment with iodine and sodium hydroxide?
According to Le-Chatelier's principle, the equilibrium constant of a reversible reaction will not shift by
A transition metal M forms a volatile chloride which has a vapour density of 94.8. If it contains 74.75% of chlorine the formula of the metal chloride will be
The density of a $ 3M $ sodium thiosulphate $ (Na_2S_2O_3) $ solution is $ 1.25\, g/mL $ . Calculate the percent by weight of sodium thiosulphate
Which of the following compounds are optically active?
The $ IUPAC $ name of $ CH_3CH(OH)CH_2CH(CH_3)CHO $ is
In allene $(C_3H_4)$ the type(s) of hybridisation of the carbon atoms, is (are)
During spontaneous discharge of an electrochemical cell Gibb's free energy will
For an electrophilic aromatic substitution reaction
Compounds, $\left.\left[ PtCl _{2} NH _{3}\right)_{4}\right] Br _{2}$ and $\left[ PtBr _{2}\left( NH _{3}\right)_{4}\right] Cl _{2}$, shows the following type of isomerism
Molarity is expressed as
Henry's law constants for aqueous solution of $CO , O _{2}, CO _{2}$ and $C _{2} H _{2}$ gases are respectively at $25^{\circ} C$ as $58 \times 10^{3}, 43 \times 10^{3}, 1.61 \times 10^{3}$ and $1.34 \times 10^{3}$. The solubility of these gases decreases in the order
For a dilute solution containing 2.5 g of a non-volatile non-electrolyte solute in 100g of water, the elevation in boiling point at 1 atm pressure is 2$^{\circ}$C. Assuming concentration of solute is much lower than the concentration of solvent, the vapour pressure (mm of Hg) of the solution is (take $K_b = 0.76 K kg mol^{-1}).$
The concentrated sulphuric acid that is peddled commercial is 95% $H_2SO_4$ by weight. If the density of this commercial acid is $1.834\, g$ $cm^{-3}$, the molarity of this solution is
In which case Raoults law is not applicable?
The solubility of a gas in a liquid increases with increase of pressure. The solubility of a gas in a liquid is directly proportional to the pressure of the gas.
The vapour pressure of two liquids $'P'$ and $'Q'$ are $80$ and $60$ torr respectively. The total vapour pressure of solution obtained by mixing $3$ mole of $P$ and $2$ mol of $Q$ would be
The unit of rate constant for the reaction, ${2H_2 + 2NO ? 2H_2O + N_2}$ which has rate = $k[H_2] [NO]^2$, is