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Q)

# Which of the following salts does not form any ppt with excess of NaOH ?

$\begin{array}{1 1}(a)\;ZnCl_2&(b)\;FeCl_3\\(c)\;CrCl_3&(d)\;CuSO_4\end{array}$

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A)
$ZnCl_2$.
Hence (a) is the correct answer.