$$ \text { In the given graph, } \mathrm{E}_{\mathrm{a}} \text { for the reverse reaction will be } $$

For the reaction $2 \mathrm{~N}_2 \mathrm{O}_{5(\mathrm{~g})} \rightarrow 4 \mathrm{NO}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})}$ initial concentration of $\mathrm{N}_2 \mathrm{O}_5$ is $2.0 \mathrm{molL}^{-1}$ and after 300 min , it is reduced to $1.4 \mathrm{molL}^{-1}$. The rate of production of $\mathrm{NO}_2\left(\mathrm{in} \mathrm{molL}^{-1} \mathrm{~min}^{-1}\right)$ is
Which of the following methods of expressing concentration are unitless?
Mole fraction and Mass percent (W/W)
Molality and Mole fraction
Mass percent (W/W) and Molality
Molality and Molarity
Select the INCORRECT statement/s from the following:
(a) 22 books have infinite significant figures
(b) In the answer of calculation $2.5 \times 1.25$ has four significant figures,.
(c) Zero's preceding to first non-zero digit are significant
(d) In the answer of calculation $12.11+18.0+1.012$ has three significant figures