List of top Chemistry Questions

For a reaction, $NO (g)+ O _{2}(g) \rightarrow 2 NO _{2}(g) ;$ Rate $=k l[N O]^{2}\left[O_{2}\right]$. If the volume of the reaction vessel is doubled, the rate of reaction
Two moles of an ideal gas are allowed to expand reversibly and isothermally at $300\, K$ from a pressure of $1\, atm$ to a pressure of $0.1\, atm$. The change in Gibbs free energy is
An elemental crystal has a density of $8570 \,kg / m ^{3}$. The packing efficiency is $0.68$. The closest distance of approach between neighbouring atom is $2.86 \,?$. What is the mass of one atom approximately?
The enthalpy of sublimation of aluminium is $330 \,kJ/mol$. Its $I^{st}, II^{nd}$ and $III^{rd}$ ionization enthalpies are $580, 1820$ and $2740 \,kJ$ respectively. How much heat has too be supplied (in $kJ$) to convert $13.5\, g$ of aluminium into $Al^{3+}$ ions and electrons at $298 \,k$
If the enthalpy of vaporization of water is $186.5 \,kJ \, mol^{-1}$, the entropy if its vaporization will be :
The wave number of the limiting line in Lyman series of hydrogen is 109678 $cm^{-1}$. The wave number of the limiting line in Balmer series of $He^{+}$ would be :
The most likely protonation site in the following molecule is
Aniline reacts with phosgene and $KOH$ to form
The number of double bonds in gammexane is :
$N_2$ and $O_2$ are converted into mono anions, $N_2^{-}$ and $O_2^{-}$ respectively. Which of the following statements is wrong ?
The ratio of oxidation states of $Cl$ in potassium chloride to that in potassium chlorate is
Which form coloured salts :
Which of the following among alkali metal is most reactive ?
Which of the following ions can be separated by a $NH_4OH$ in presence of $NH_4Cl$
Consider the following phenols : The decreasing order of acidity of the above phenols is
Which one of the following pairs is isostructural (i.e., having the same shape and hybridization)?
The correct order of magnetic moments (spin only values in B.M.) is:
$3.92\,g$ of ferrous ammonium sulphate react completely with $50\, ml \frac{N}{10} KMnO_{4}$ solution. The percentage purity of the sample is
The volume strength of $1.5 \, N \, H_2O_2$ solution is
Peptisation involves
The rate constant for forward reaction and backward reaction of hydrolysis of ester are $1.1 \times 10^{-2}$ and $1.5 \times 10^{-3}$ per minute respectively. Equilibrium constant for the reaction is $CH _{3} COOC _{2} H _{5}+ H _{2} O \rightleftharpoons CH _{3} COOH + C _{2} H _{5} OH$
The solubility product of $Ag _{2} CrO _{4}$ is $32 \times 10^{-12}$. What is the concentration of $CrO _{4}^{-}$ions in that solution?
The equivalent conductivity of a solution containing $2.54\, g$ of $CuSO _{4}$ per $L$ is $91.0\, W ^{-1} cm ^{2} eq ^{-1}$. Its conductivity would be
One mole of $PCl_5$ is heated in a closed 2 $dm^3$ vessel. At equilibrium 40% $PCl_5$ is dissociated. Calculate the equilibrium constant.
The correct order of oxidising power is : $VO_2^+$ $< Cr_2O_7^{2-} < MnO_4^-$ The oxidation state of $Mn$ is $+7$.