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# The formula of pertitanic acid is

$\begin{array}{1 1}(a)\;H_2TiO_5\\(b)\;H_2TiO_2\\(c)\;H_2TiO_4\\(d)\;H_2TiO_3\end{array}$

The formula of pertitanic acid is $H_2TiO_4$
Hence (c) is the correct answer.