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A>B>C. In structure A all the carbon atoms as well as nitrogen atom has octet configuration in their valence shell, making it more less energetic and more stable. Whereas B and C have atleast an atom that does not have octet. Further in B the positive charge on the carbon atom is close to lone pair of nitrogen. This results in more attraction than in case of ...

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It is rather: $$\ce{2 Al + 6 H2O + 2 OH- -> 2 [Al(OH)4]^- + 3 H2 ^}$$where $\ce{OH-}$ comes either from hydroxide dissociation, either from carbonate hydrolysis. $$\ce{CO3^2- + H2O <=> HCO3- + OH-}$$ The reaction with carbonate would gradually slow down as the carbonate/bicarbonate buffer will kick in. Initial $\mathrm{pH}$ is ( see notes below ...

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There are several ways to look at this question. On one hand, the heat of formation of $\ce{CuCl2}$ $(\pu{49.2 kcal/mol})$ is greater than the heat of formation of $\ce{CuCl}$ $(\pu{32.5 kcal/mol}),$ so if there is excess $\ce{Cl2},$ the product would naturally be the dichloride. On a kinetic basis, even with just a stoichiometric amount of chlorine \$(\ce{1/...

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