- AAn ester
- BA ketone
- CAn ether
- ✓An acid anhydride
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$Na _2 O + H _2 O \rightarrow 2 X$
$Cl _2 O _7+ H _2 O \rightarrow 2 Y$
$Zn \,|\,ZnSO_4\,(0.01\,M)\,||\,CuSO_4\,(1.0\, M)\,|\,Cu,$
the $emf$ of this Daniell cell is $E_1.$ When the concentration of $ZnSO_4$ is changed to $1.0\, M$ and that of $CuSO_4$ changed to $0.01\, M,$ the $emf$ changes to $E_2.$ Fromthe followings, which one is the relationship between $E_1$ and $E_2$ ? (Given, $RT/F = 0.059$)

$\Delta H_{f({C_2}{H_2})(g)}^o\, = \,230\,kJ\,mo{l^{ - 1}}$
$\Delta H_{f({C_6}{H_6})(g)}^o\, = \,85\,kJ\,mo{l^{ - 1}}$
Calculate the standard heat of trimerisation of ethyne to benzene.
$3{C_2}{H_2}(g) \to {C_6}{H_6}(g)$
......$kJ\, mol^{-1}$