Chemistry Physical Chemistry questions from NEET UG 2018.
The bond dissociation energies of ${X}_{2} {Y}_{2}$ and $\mathrm{XY}$ are in the ratio of $1 :0.5 :1.\Delta H$ for the formation of $\mathrm{XY}$ is $-200\mathrm{kJ} {\mathrm{mol}}^{-1}$. What will be the bond dissociation energy of ${X}_{2}$?
The solubility of ${\mathrm{BaSO}}_{4}$ in water is $2.42\times {10}^{-3}{\mathrm{gL}}^{-1}$ at $298 K.$ The value of its solubility product $({K}_{\mathrm{sp}})$ will be (Given- the molar mass of ${\mathrm{BaSO}}_{4}=233 g {\mathrm{mol}}^{-1}$)
In which case the number of molecules of water maximum?
Consider the change in oxidation state of Bromine corresponding to different emf values, as shown in the diagram below:  Then, what is the species undergoing disproportionation?
Following solutions were prepared by mixing different volumes of $\mathrm{NaOH}$ and $\mathrm{HCl}$ of different concentrations. (i) $60 \mathrm{mL}\frac{M}{10} \mathrm{HCl}+40\mathrm{mL}\frac{M}{10}\mathrm{NaOH}$ (ii) $55 \mathrm{mL}\frac{M}{10}\mathrm{HCl}+45\mathrm{mL}\frac{M}{10}\mathrm{NaOH}$ (iii) $75 \mathrm{mL}\frac{M}{5}\mathrm{HCl}+25\mathrm{mL}\frac{M}{5}\mathrm{NaOH}$ (iv) $100 \mathrm{mL}\frac{M}{10}\mathrm{HCl}+100 \mathrm{mL}\frac{M}{10}\mathrm{NaOH}$ The $\mathrm{pH}$ of which one of them will be equal to $1$?
For the redox reaction: ${\mathrm{MnO}}_{4}^{-}+{C}_{2}{O}_{4}^{2-}+{H}^{+}\rightarrow {\mathrm{Mn}}^{2+}+{\mathrm{CO}}_{2}+{H}_{2}O$ What are the correct coefficients of the reactants for the balanced equation?
A mixture of $2.3g$ formic acid and $4.5g$ oxalic acid is treated with concentrate ${H}_{2}{\mathrm{SO}}_{4}$. The evolved gaseous mixture is passed through $\mathrm{KOH}$ pellets. What will be the weight in grams of the remaining product at $\mathrm{STP}$?
When initial concentration of the reactant is doubled, what happens to the half-life period of a zero order reaction?
What is the correct difference between first and second order reactions?
Which one of the following conditions will favor the maximum formation of the product in the reaction? ${A}_{2}(g)+{B}_{2}(g)\rightleftharpoons {X}_{2}(g){\Delta }_{r}H=-X \mathrm{kJ}$
Which one is a wrong statement?