Which molecule is not linear

In the above first order reaction the initial concentration of $\mathrm{N}_{2} \mathrm{O}_{5}$ is $2.40 \times 10^{-2}\, \mathrm{~mol} \,\mathrm{~L}^{-1}$ at $318 \,K.$ The concentration of $\mathrm{N}_{2} \mathrm{O}_{5}$ after $1\, hour$ was $1.60 \times 10^{-2}\, \mathrm{~mol} \,\mathrm{~L}^{-1}$, The rate constant of the reaction at $318\, \mathrm{~K}$ is $.....\,\times 10^{-3} \mathrm{~min}^{-1}$. (Nearest integer)

[Given: $\log 3=0.477, \log 5=0.699$ ]

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One mole of potassium dichromate completely oxidises the following number of moles of ferrous sulphate in acidic medium

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$HC\equiv CH\xrightarrow[{{H}_{2}}S{{O}_{4}}]{HgS{{O}_{4}}}\,\,\xrightarrow[HOH]{C{{H}_{3}}MgBr}\,\,\xrightarrow{P/B{{r}_{2}}}\left( X \right);$ $(X)$ is

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Chloral $+$ clorobenzin $\xrightarrow{{conc.\,{H_2}S{O_4}}}$ product.

The product is :-

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A reaction that is of the first order with respect to reactant $A$ has a rate constant $6\,{\min ^{ - 1}}.$ If we start with $[A] = 0.5\,mol\,\,{l^{ - 1}}$, when would $[A]$ reach the value $ 0.05\,mol$ ${l^{ - 1}}$ ...... $\min$

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What will be the heat of formation of methane, if the heat of combustion of carbon is $'-x'\, kJ$, heat of formation of water is $'-y'\, kJ$ and heat of combustion of methane is $'z'\, kJ$ ?