(i)What is the freezing point of $0.4$ molal solution of acetic acid in benzene in which it dimerises to the extent of $85\%$ Freezing point of benzene is $278.4 \;k$ and its molar heat of fusion is $10.042\;kj\; mol^{-1}$ (ii) Write balanced chemical equation for the following reactions : (a) Thermal decomposition of ammonium dichromate. (b) Reaction of $Cl_2$ with cold and deleted NaOH (c) When phosphine is passed through mercuric chloride solution .

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