SAMPLE QUESTION PAPER 3

What is flux? How is it useful?

What is meant by benefaction process?

Do the vital functions of the body such as digestion get affected during fever? Explain.

A reaction is of second order with respect to a reactant. How is the rate of reaction affected if the concentration of the reactants is reduced to one-fourth? What is the units of rate constant for such a reaction?

All energetically effective collisions do not result in a chemical change. Explain with the help of an example.

A specific reaction is $50\%$ complete in $20$ minutes at $300 \mathrm{K}$ and the same reaction is again $50\%$ completes in $5$ minutes at $350 \mathrm{K}$. Calculate the activation energy if it is a first order reaction.

A ketone $\mathrm{A}$ $\left({\mathrm{C}}_4{\mathrm{H}}_8\mathrm{O}\right)$ which undergoes a haloform reaction gives compound $\mathrm{B}$ on reduction. $\mathrm{B}$ on heating with sulphuric acid gives a compound $\mathrm{C}$ which forms monozonide $\mathrm{D}$. $\mathrm{D}$ on hydrolysis with zinc dust gives only $\mathrm{E}$. Identify $\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}$ and $\mathrm{E}$. Write the reactions involved.

A compound $\mathrm{A}$ $\left({\mathrm{C}}_2{\mathrm{H}}_6\mathrm{O}\right)$ on oxidation by PCC gave $\mathrm{B}$, which on treatment with aqueous alkali and subsequent heating furnished $\mathrm{C}$. $\mathrm{B}$ on oxidation by ${\mathrm{KMnO}}_4$, forms a monobasic carboxylic acid with molar mass $60 {\mathrm{gmol}}^{-1}$. Deduce the structures of $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$.