SAMPLE QUESTION PAPER 5

Insulin maintains the blood _____ level in human body.

${\mathrm{Fe}}^{+2}\to {\mathrm{Fe}}^{3+}+{\mathrm{e}}^{-} (\mathrm{E}°=0.77 \mathrm{V}); {\mathrm{Ag}}^{+}+ {\mathrm{e}}^{-} \to \mathrm{Ag} (\mathrm{E}°=0.80 \mathrm{V})$. Calculate the emf of the following cell reaction at $25°\mathrm{C}$. 

Nitrogen pentoxide decomposes according to the following equation, $2{\mathrm{N}}_2{\mathrm{O}}_5\left(\mathrm{g}\right)\to 4{\mathrm{NO}}_2\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)$. This first order reaction was allowed to proceed at $40°\mathrm{C}$ and the data given below: 

Calculate the initial rate of reaction.

For a chemical reaction, variation in concentration $\mathrm{In}\left[\mathrm{R}\right]$ versus time $\left(\min \right)$ plot is given below :

What is the order of reaction?

For a chemical reaction, variation in concentration $\mathrm{In}\left[\mathrm{R}\right]$ versus time $\left(\min \right)$ plot is given below :

What are the units of rate constant $\mathrm{k}$ for the reaction?

For a chemical reaction, variation in concentration $\mathrm{In}\left[\mathrm{R}\right]$ versus time $\left(\min \right)$ plot is given below :

If the initial concentration of the reactant is half of the original concentration, how will ${\mathrm{t}}_{\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}$  change?

For a chemical reaction, variation in concentration $\mathrm{In}\left[\mathrm{R}\right]$ versus time $\left(\min \right)$ plot is given below :

Draw the plot of log $\left[{\mathrm{R}}_{\circ }\right]/\left[\mathrm{R}\right]$ versus time $\left(\mathrm{s}\right)$.

Half-life of a first order reaction is $5\times {10}^4 \mathrm{s}$. Then, what percentage of the initial reactant will react in $2 \mathrm{h}$?