The correct increasing order for the wavelengths of absorption in the visible region for the following Co$^{3+}$ complexes is:(i) [Co(NH$_3$)$_6$]$^{3+}$(ii) [Co(H$_2$O)$_6$]$^{3+}$(iii) [Co(en)$_3$]$^{3+}$
A, B and C are weak acids. Their dissociation constants (\(K_a(A)\), \(K_a(B)\), \(K_a(C)\)) are \[ 3.5 \times 10^{-4}, 1 \times 10^{-5} \text{ and } 5 \times 10^{-10} \text{ respectively. The pH of 1L of 0.01 M each of these solutions follow the order.} \]
$P_4\text{O}_\text{10} \text{H}_2\text{O} \xrightarrow{\text{X}} \xrightarrow{\text{Y}} \text{The number of P-OH, P=O bonds in Y is respectively}$
Match the following: