Physical Chemistry - Chemistry Previous Year Questions

Calculate the wavelength associated with an electron moving with a velocity of \(10^6 \mathrm{~m} / \mathrm{s}\) (mass of electron \(=9.1 \times 10^{-31} \mathrm{~kg}, h=6.6 \times 10^{-34} \mathrm{~kg} \mathrm{~m}^2 \mathrm{~s}^{-1}\) )

\(0.20 \mathrm{~g}\) of an organic compound gave \(0.12 \mathrm{~g}\) of \(\mathrm{AgBr}\). By using Carius method, the percentage of bromine in the compound will be

\(\mathrm{MnO}_4^{-}\) is good oxidising agent in different medium changing to

$$\mathrm{MnO}_4^{-} \rightarrow \mathrm{Mn}^{2+} \rightarrow \mathrm{MnO}_4^{2-} \rightarrow \mathrm{MnO}_2 \rightarrow \mathrm{Mn}_2 \mathrm{O}_3$$

Change in oxidation number respectively are :

Using the Gibbs free energy change, $\Delta G^{\circ}=+63.3 \mathrm{~kJ}$. For the reaction,

$$\mathrm{Ag}_2 \mathrm{CO}_3 \longrightarrow 2 \mathrm{Ag}^{+}(a q)+\mathrm{CO}_3^{2-}(a q)$$

The $K_{\text {sp }}$ of $\mathrm{Ag}_2 \mathrm{CO}_3(s)$ in water at $25^{\circ} \mathrm{C}$ is

What is the total number of electrons that can have the values \(n=2, l=1, s=1 / 2\) in the electronic configuration \(1 s^2 2 s^2 2 p^3\) ?

If \(\mathrm{AgI}\) crystallises in zinc blende structure with \(\mathrm{I}^{-}\) ions at lattice points then the fraction of tetrahedral voids occupied by \(\mathrm{Ag}^{+}\) ions is